International Phonetic Alphabet

Open-tail ⟨ɡ⟩ and loop-tail ⟨g⟩ are graphic variants. Open-tail ⟨ɡ⟩ was the original IPA symbol, but both are now considered correct. See history of the IPA for details.

The letters chosen for the IPA are meant to harmonize with the Latin alphabet.[note 7] For this reason, most letters are either Latin or Greek, or modifications thereof. Some letters are neither: for example, the letter denoting the glottal stop, ⟨ʔ⟩, originally had the form of a dotless question mark, and derives from an apostrophe. A few letters, such as that of the voiced pharyngeal fricative, ⟨ʕ⟩, were inspired by other writing systems (in this case, the Arabic letter ⟨ﻉ⟩, ʿayn, via the reversed apostrophe).[9]

Some letter forms derive from existing letters:

1. The right-swinging tail, as in ⟨ʈ ɖ ɳ ɽ ʂ ʐ ɻ ɭ ⟩, indicates retroflex articulation. It originates from the hook of an r.
2. The top hook, as in ⟨ɠ ɗ ɓ⟩, indicates implosion.
3. Several nasal consonants are based on the form ⟨n⟩: ⟨n ɲ ɳ ŋ⟩. ⟨ɲ⟩ and ⟨ŋ⟩ derive from ligatures of gn and ng, and ⟨ɱ⟩ is an ad hoc imitation of ⟨ŋ⟩.
4. Letters turned 180 degrees, such as ⟨ɐ ɔ ə ɟ ɓ ɥ ɾ ɯ ɹ ʇ ʊ ʌ ʍ ʎ⟩ (from ⟨a c e f ɡ h ᴊ m r t Ω v w y⟩),[note 8] when either the original letter (e.g., ⟨ɐ ə ɹ ʇ ʍ⟩) or the turned one (e.g., ⟨ɔ ɟ ɓ ɥ ɾ ɯ ʌ ʎ⟩) is reminiscent of the target sound. This was easily done in the era of mechanical typesetting, and had the advantage of not requiring the casting of special type for IPA symbols, much as the same sorts had traditionally often been used for ⟨b⟩ and ⟨q⟩, ⟨d⟩ and ⟨p⟩, ⟨n⟩ and ⟨u⟩, ⟨6⟩ and ⟨9⟩ to reduce cost.

   

   An example of a font that uses turned small-capital omega, ⟨ꭥ⟩, for the vowel ⟨ʊ⟩. The symbol had originally been a small-capital ⟨ᴜ⟩.

5. Among consonant letters, the small capital letters ⟨ɢ ʜ ʟ ɴ ʀ ʁ⟩, and also ⟨ꞯ⟩ in extIPA, indicate more guttural sounds than their base letters. (⟨ʙ⟩ is a late exception.) Among vowel letters, small capitals indicate "lax" vowels. Most of the original small-cap vowel letters have been modified into more distinctive shapes (e.g. ⟨ʊ ɤ ɛ ʌ⟩), with only ⟨ɪ ʏ⟩ remaining as small capitals.

The International Phonetic Alphabet is based on the Latin alphabet, using as few non-Latin forms as possible.[6] The Association created the IPA so that the sound values of most consonant letters taken from the Latin alphabet would correspond to "international usage" (approximately Classical Latin).[6] Hence, the letters ⟨b⟩, ⟨d⟩, ⟨f⟩, (hard) ⟨ɡ⟩, (non-silent) ⟨h⟩, (unaspirated) ⟨k⟩, ⟨l⟩, ⟨m⟩, ⟨n⟩, (unaspirated) ⟨p⟩, (voiceless) ⟨s⟩, (unaspirated) ⟨t⟩, ⟨v⟩, ⟨w⟩, and ⟨z⟩ have more or less the values used in English; and the vowel letters from the Latin alphabet (⟨a⟩, ⟨e⟩, ⟨i⟩, ⟨o⟩, ⟨u⟩) correspond to the (long) sound values of Latin: [i] is like the vowel in machine, [u] is as in rule, etc. Other letters, such as ⟨j⟩, ⟨r⟩, and ⟨y⟩, differ from English, but have these values in other European languages.

This inventory was extended by using small-capital and cursive forms, diacritics and rotation. There are also several symbols derived or taken from the Greek alphabet, though the sound values may differ. For example, ⟨ʋ⟩ is a vowel in Greek, but an only indirectly related consonant in the IPA. For most of these, subtly different glyph shapes have been devised for the IPA, namely ⟨ɑ⟩, ⟨ꞵ⟩, ⟨ɣ⟩, ⟨ɛ⟩, ⟨ɸ⟩, ⟨ꭓ⟩, and ⟨ʋ⟩, which are encoded in Unicode separately from their parent Greek letters, though one of them – ⟨θ⟩ – is not, while both Latin ⟨ꞵ⟩, ⟨ꭓ⟩ and Greek ⟨β⟩, ⟨χ⟩ are in common use.[12]

The sound values of modified Latin letters can often be derived from those of the original letters.[13] For example, letters with a rightward-facing hook at the bottom represent retroflex consonants; and small capital letters usually represent uvular consonants. Apart from the fact that certain kinds of modification to the shape of a letter generally correspond to certain kinds of modification to the sound represented, there is no way to deduce the sound represented by a symbol from its shape (as for example in Visible Speech) nor even any systematic relation between signs and the sounds they represent (as in Hangul).

Beyond the letters themselves, there are a variety of secondary symbols which aid in transcription. Diacritic marks can be combined with IPA letters to transcribe modified phonetic values or secondary articulations. There are also special symbols for suprasegmental features such as stress and tone that are often employed.

There are two principal types of brackets used to set off (delimit) IPA transcriptions:

Other conventions are less commonly seen:

All three of the above are provided by the IPA Handbook. The following are not, but may be seen in IPA transcription or in associated material (especially angle brackets):

For example,

In some English accents, the phoneme /l/, which is usually spelled as ⟨l⟩ or ⟨ll⟩, is articulated as two distinct allophones: the clear [l] occurs before vowels and the consonant /j/, whereas the dark [ɫ]/[lˠ] occurs before consonants, except /j/, and at the end of words.[24]

the alternations /f/ – /v/ in plural formation in one class of nouns, as in knife /naɪf/ – knives /naɪvz/, which can be represented morphophonemically as {naɪV} – {naɪV+z}. The morphophoneme {V} stands for the phoneme set {/f/, /v/}.[25]

[ˈf\faɪnəlz ˈhɛld ɪn (.) ⸨knock on door⸩ bɑɹsə{_𝑝ˈloʊnə and ˈmədɹɪd _𝑝}] — f-finals held in Barcelona and Madrid.[26]

IPA letters have cursive forms designed for use in manuscripts and when taking field notes, but the 1999 Handbook of the International Phonetic Association recommended against their use, as cursive IPA is "harder for most people to decipher."[27]

Several Braille adaptations of the IPA have seen use, the most recent published in 2008 and widely accepted since 2011. It does not have complete support for tone.

IPA is popular for transcription by linguists. Some American linguists, however, use a mix of IPA with Americanist phonetic notation or use some nonstandard symbols for various reasons.[36] Authors who employ such nonstandard use are encouraged to include a chart or other explanation of their choices, which is good practice in general, as linguists differ in their understanding of the exact meaning of IPA symbols and common conventions change over time.

Many British dictionaries, including the Oxford English Dictionary and some learner's dictionaries such as the Oxford Advanced Learner's Dictionary and the Cambridge Advanced Learner's Dictionary, now use the International Phonetic Alphabet to represent the pronunciation of words.[37] However, most American (and some British) volumes use one of a variety of pronunciation respelling systems, intended to be more comfortable for readers of English. For example, the respelling systems in many American dictionaries (such as Merriam-Webster) use ⟨y⟩ for IPA [j] and ⟨sh⟩ for IPA [ʃ], reflecting common representations of those sounds in written English,[38] using only letters of the English Roman alphabet and variations of them. (In IPA, [y] represents the sound of the French ⟨u⟩ (as in tu), and [sh] represents the pair of sounds in grasshopper.)

The IPA is also not universal among dictionaries in languages other than English. Monolingual dictionaries of languages with phonemic orthographies generally do not bother with indicating the pronunciation of most words, and tend to use respelling systems for words with unexpected pronunciations. Dictionaries produced in Israel use the IPA rarely and sometimes use the Hebrew alphabet for transcription of foreign words.[note 13] Bilingual dictionaries that translate from foreign languages into Russian usually employ the IPA, but monolingual Russian dictionaries occasionally use pronunciation respelling for foreign words.[note 14] The IPA is more common in bilingual dictionaries, but there are exceptions here too. Mass-market bilingual Czech dictionaries, for instance, tend to use the IPA only for sounds not found in Czech.[39]

IPA letters have been incorporated into the alphabets of various languages, notably via the Africa Alphabet in many sub-Saharan languages such as Hausa, Fula, Akan, Gbe languages, Manding languages, Lingala, etc. Capital case variants have been created for use in these languages. For example, Kabiyè of northern Togo has Ɖ ɖ, Ŋ ŋ, Ɣ ɣ, Ɔ ɔ, Ɛ ɛ, Ʋ ʋ. These, and others, are supported by Unicode, but appear in Latin ranges other than the IPA extensions.

In the IPA itself, however, only lower-case letters are used. The 1949 edition of the IPA handbook indicated that an asterisk ⟨*⟩ might be prefixed to indicate that a word was a proper name,[40] but this convention was not included in the 1999 Handbook, which notes the contrary use of the asterisk as a placeholder for a sound or feature that does not have a symbol.

The IPA has widespread use among classical singers during preparation as they are frequently required to sing in a variety of foreign languages. They are also taught by vocal coaches to perfect diction and improve tone quality and tuning.[41] Opera librettos are authoritatively transcribed in IPA, such as Nico Castel's volumes[42] and Timothy Cheek's book Singing in Czech.[43] Opera singers' ability to read IPA was used by the site Visual Thesaurus, which employed several opera singers "to make recordings for the 150,000 words and phrases in VT's lexical database ... for their vocal stamina, attention to the details of enunciation, and most of all, knowledge of IPA".[44]

A pulmonic consonant is a consonant made by obstructing the glottis (the space between the vocal cords) or oral cavity (the mouth) and either simultaneously or subsequently letting out air from the lungs. Pulmonic consonants make up the majority of consonants in the IPA, as well as in human language. All consonants in English fall into this category.[47]

The pulmonic consonant table, which includes most consonants, is arranged in rows that designate manner of articulation, meaning how the consonant is produced, and columns that designate place of articulation, meaning where in the vocal tract the consonant is produced. The main chart includes only consonants with a single place of articulation.

Notes

• In rows where some letters appear in pairs (the obstruents), the letter to the right represents a voiced consonant (except breathy-voiced [ɦ]).[48] In the other rows (the sonorants), the single letter represents a voiced consonant.
• While IPA provides a single letter for the coronal places of articulation (for all consonants but fricatives), these do not always have to be used exactly. When dealing with a particular language, the letters may be treated as specifically dental, alveolar, or post-alveolar, as appropriate for that language, without diacritics.
• Shaded areas indicate articulations judged to be impossible.
• The letters [β, ð, ʁ, ʕ, ʢ] are canonically voiced fricatives but may be used for approximants.[49]
• In many languages, such as English, [h] and [ɦ] are not actually glottal, fricatives, or approximants. Rather, they are bare phonation.[50]
• It is primarily the shape of the tongue rather than its position that distinguishes the fricatives [ʃ ʒ], [ɕ ʑ], and [ʂ ʐ].
• [ʜ, ʢ] are defined as epiglottal fricatives under the "Other symbols" section in the official IPA chart, but they may be treated as trills at the same place of articulation as [ħ, ʕ] because trilling of the aryepiglottic folds typically co-occurs.[51]
• Some listed phones are not known to exist as phonemes in any language.

Non-pulmonic consonants are sounds whose airflow is not dependent on the lungs. These include clicks (found in the Khoisan languages and some neighboring Bantu languages of Africa), implosives (found in languages such as Sindhi, Hausa, Swahili and Vietnamese), and ejectives (found in many Amerindian and Caucasian languages).

Notes

• Clicks have traditionally been described as consisting of a forward place of articulation, commonly called the click 'type' or historically the 'influx', and a rear place of articulation, which when combined with the voicing, aspiration, nasalization, affrication, ejection, timing etc. of the click is commonly called the click 'accompaniment' or historically the 'efflux'. The IPA click letters indicate only the click type (forward articulation and release). Therefore, all clicks require two letters for proper notation: ⟨k͡ǂ, ɡ͡ǂ, ŋ͡ǂ, q͡ǂ, ɢ͡ǂ, ɴ͡ǂ⟩ etc., or with the order reversed if both the forward and rear releases are audible. The letter for the rear articulation is frequently omitted, in which case a ⟨k⟩ may usually be assumed. However, some researchers dispute the idea that clicks should be analyzed as doubly articulated, as the traditional transcription implies, and analyze the rear occlusion as solely a part of the airstream mechanism.[52] In transcriptions of such approaches, the click letter represents both places of articulation, with the different letters representing the different click types, and diacritics are used for the elements of the accompaniment: ⟨ǂ, ǂ̬, ǂ̃⟩ etc.
• Letters for the voiceless implosives ⟨ƥ, ƭ, ƈ, ƙ, ʠ⟩ are no longer supported by the IPA, though they remain in Unicode. Instead, the IPA typically uses the voiced equivalent with a voiceless diacritic: ⟨ɓ̥, ʛ̥⟩, etc..
• The letter for the retroflex implosive, ⟨ᶑ ⟩, is not "explicitly IPA approved" (Handbook, p. 166), but has the expected form if such a symbol were to be approved.
• The ejective diacritic is placed at the right-hand margin of the consonant, rather than immediately after the letter for the stop: ⟨t͜ʃʼ⟩, ⟨kʷʼ⟩. In imprecise transcription, it often stands in for a superscript glottal stop in glottalized but pulmonic sonorants, such as [mˀ], [lˀ], [wˀ], [aˀ] (also transcribable as creaky [m̰], [l̰], [w̰], [a̰]).

Affricates and co-articulated stops are represented by two letters joined by a tie bar, either above or below the letters with no difference in meaning.[note 16] Affricates are optionally represented by ligatures (e.g. ⟨ʦ, ʣ, ʧ, ʤ, ʨ, ʥ, ꭧ, ꭦ ⟩), though this is no longer official IPA usage[1] because a great number of ligatures would be required to represent all affricates this way. Alternatively, a superscript notation for a consonant release is sometimes used to transcribe affricates, for example ⟨tˢ⟩ for [t͜s], paralleling [kˣ] ~ [k͜x]. The letters for the palatal plosives ⟨c⟩ and ⟨ɟ⟩ are often used as a convenience for [t͜ʃ] and [d͜ʒ] or similar affricates, even in official IPA publications, so they must be interpreted with care.

Co-articulated consonants are sounds that involve two simultaneous places of articulation (are pronounced using two parts of the vocal tract). In English, the [w] in "went" is a coarticulated consonant, being pronounced by rounding the lips and raising the back of the tongue. Similar sounds are [ʍ] and [ɥ]. In some languages, plosives can be double-articulated, for example in the name of Laurent Gbagbo.

Notes

• [ɧ], the Swedish sj-sound, is described by the IPA as a "simultaneous [ʃ] and [x]", but it is unlikely such a simultaneous fricative actually exists in any language.[53]
• Multiple tie bars can be used: ⟨a͡b͡c⟩ or ⟨a͜b͜c⟩. For instance, if a prenasalized stop is transcribed ⟨m͡b⟩, and a doubly articulated stop ⟨ɡ͡b⟩, then a prenasalized doubly articulated stop would be ⟨ŋ͡m͡ɡ͡b⟩
• If a diacritic needs to be placed on or under a tie bar, the combining grapheme joiner (U+034F) needs to be used, as in [b͜͏̰də̀bdɷ̀] 'chewed' (Margi). Font support is spotty, however.

Tongue positions of cardinal front vowels, with highest point indicated. The position of the highest point is used to determine vowel height and backness.

X-ray photos show the sounds [i, u, a, ɑ].

The IPA defines a vowel as a sound which occurs at a syllable center.[54] Below is a chart depicting the vowels of the IPA. The IPA maps the vowels according to the position of the tongue.

Front Central Back Close i y ɨ ʉ ɯ u Near-close ɪ ʏ ʊ Close-mid e ø ɘ ɵ ɤ o Mid e̞ ø̞ ə ɤ̞ o̞ Open-mid ɛ œ ɜ ɞ ʌ ɔ Near-open æ ɐ Open a ɶ ä ɑ ɒ

IPA help  audio full chart template

The vertical axis of the chart is mapped by vowel height. Vowels pronounced with the tongue lowered are at the bottom, and vowels pronounced with the tongue raised are at the top. For example, [ɑ] (the first vowel in father) is at the bottom because the tongue is lowered in this position. [i] (the vowel in "meet") is at the top because the sound is said with the tongue raised to the roof of the mouth.

In a similar fashion, the horizontal axis of the chart is determined by vowel backness. Vowels with the tongue moved towards the front of the mouth (such as [ɛ], the vowel in "met") are to the left in the chart, while those in which it is moved to the back (such as [ʌ], the vowel in "but") are placed to the right in the chart.

In places where vowels are paired, the right represents a rounded vowel (in which the lips are rounded) while the left is its unrounded counterpart.

Diphthongs are typically specified with a non-syllabic diacritic, as in ⟨uɪ̯⟩ or ⟨u̯ɪ⟩, or with a superscript for the on- or off-glide, as in ⟨uᶦ⟩ or ⟨ᵘɪ⟩. Sometimes a tie bar is used: ⟨u͡ɪ⟩, especially if it is difficult to tell if the diphthong is characterized by an on-glide, an off-glide or is variable.

Notes

• ⟨a⟩ officially represents a front vowel, but there is little if any distinction between front and central open vowels (see Vowel § Acoustics), and ⟨a⟩ is frequently used for an open central vowel.[36] If disambiguation is required, the retraction diacritic or the centralized diacritic may be added to indicate an open central vowel, as in ⟨a̠⟩ or ⟨ä⟩.

These symbols describe the features of a language above the level of individual consonants and vowels, that is, at the level of syllable, word or phrase. These include prosody, pitch, length, stress, intensity, tone and gemination of the sounds of a language, as well as the rhythm and intonation of speech.[57] Various ligatures of pitch/tone letters and diacritics are provided for by the Kiel convention and used in the IPA Handbook despite not being found in the summary of the IPA alphabet found on the one-page chart.

Under capital letters below we will see how a carrier letter may be used to indicate suprasegmental features such as labialization or nasalization. Some authors omit the carrier letter, for e.g. suffixed [kʰuˣt̪s̟]ʷ or prefixed [ʷkʰuˣt̪s̟],[58] or place a spacing variant of a diacritic such as ⟨˔⟩ or ⟨˜⟩ at the beginning or end of a word to indicate that it applies to the entire word.[59]

The old staveless tone letters, which are effectively obsolete, include high ⟨ˉe⟩, mid ⟨˗e⟩, low ⟨ˍe⟩, rising ⟨ˊe⟩ and falling ⟨ˋe⟩.

Officially, the stress marks ⟨ˈ ˌ⟩ appear before the stressed syllable, and thus mark the syllable boundary as well as stress (though the syllable boundary may still be explicitly marked with a period).[60] Occasionally the stress mark is placed immediately before the nucleus of the syllable, after any consonantal onset.[61] In such transcriptions, the stress mark does not mark a syllable boundary. The primary stress mark may be doubled ⟨ˈˈ⟩ for extra stress (such as prosodic stress). The secondary stress mark is sometimes seen doubled ⟨ˌˌ⟩ for extra-weak stress, but this convention has not been adopted by the IPA.[60] Some dictionaries place both stress marks before a syllable, ⟨¦⟩, to indicate that pronunciations with either primary or secondary stress are heard, though this is not IPA usage.[62]

There are three boundary markers: ⟨.⟩ for a syllable break, ⟨|⟩ for a minor prosodic break and ⟨‖⟩ for a major prosodic break. The tags 'minor' and 'major' are intentionally ambiguous. Depending on need, 'minor' may vary from a foot break to a break in list-intonation to a continuing–prosodic unit boundary (equivalent to a comma), and while 'major' is often any intonation break, it may be restricted to a final–prosodic unit boundary (equivalent to a period). The 'major' symbol may also be doubled, ⟨‖‖⟩, for a stronger break.[note 21]

Although not part of the IPA, the following additional boundary markers are often used in conjunction with the IPA: ⟨μ⟩ for a mora or mora boundary, ⟨σ⟩ for a syllable or syllable boundary, ⟨+⟩ for a morpheme boundary, ⟨#⟩ for a word boundary (may be doubled, ⟨##⟩, for e.g. a breath-group boundary),[64] ⟨$⟩ for a phrase or intermediate boundary and ⟨%⟩ for a prosodic boundary. For example, C# is a word-final consonant, %V a post-pausa vowel, and T% an IU-final tone (edge tone).

⟨ꜛ ꜜ⟩ are defined in the Handbook as "upstep" and "downstep", concepts from tonal languages. However, the upstep symbol can also be used for pitch reset, and the IPA Handbook uses it for prosody in the illustration for Portuguese, a non-tonal language.

Phonetic pitch and phonemic tone may be indicated by either diacritics placed over the nucleus of the syllable (e.g., high-pitch ⟨é⟩) or by Chao tone letters placed either before or after the word or syllable. There are three graphic variants of the tone letters: with or without a stave, and facing left or facing right from the stave. The stave was introduced with the 1989 Kiel Convention, as was the option of placing a staved letter after the word or syllable, while retaining the older conventions. There are therefore six ways to transcribe pitch/tone in the IPA: i.e., ⟨é⟩, ⟨˦e⟩, ⟨e˦⟩, ⟨꜓e⟩, ⟨e꜓⟩ and ⟨ˉe⟩ for a high pitch/tone.[60][65][66] Of the tone letters, only left-facing staved letters and a few representative combinations are shown in the summary on the Chart, and in practice it is currently more common for tone letters to occur after the syllable/word than before, as in the Chao tradition. Placement before the word is a carry-over from the pre-Kiel IPA convention, as is still the case for the stress and upstep/downstep marks. The IPA endorses the Chao tradition of using the left-facing tone letters, ⟨˥ ˦ ˧ ˨ ˩⟩, for underlying tone, and the right-facing letters, ⟨꜒ ꜓ ꜔ ꜕ ꜖⟩, for surface tone, as occurs in tone sandhi, and for the intonation of non-tonal languages.[note 22] In the Portuguese illustration in the 1999 Handbook, tone letters are placed before a word or syllable to indicate prosodic pitch (equivalent to [↗︎] global rise and [↘︎] global fall, but allowing more precision), and in the Cantonese illustration they are placed after a word/syllable to indicate lexical tone. Theoretically therefore prosodic pitch and lexical tone could be simultaneously transcribed in a single text, though this is not a formalized distinction.

Rising and falling pitch, as in contour tones, are indicated by combining the pitch diacritics and letters in the table, such as grave plus acute for rising [ě] and acute plus grave for falling [ê]. Only six combinations of two diacritics are supported, and only across three levels (high, mid, low), despite the diacritics supporting five levels of pitch in isolation. The four other explicitly approved rising and falling diacritic combinations are high/mid rising [e᷄], low rising [e᷅], high falling [e᷇], and low/mid falling [e᷆].[note 23]

The Chao tone letters, on the other hand, may be combined in any pattern, and are therefore used for more complex contours and finer distinctions than the diacritics allow, such as mid-rising [e˨˦], extra-high falling [e˥˦], etc. There are 20 such possibilities. However, in Chao's original proposal, which was adopted by the IPA in 1989, he stipulated that the half-high and half-low letters ⟨˦ ˨⟩ may be combined with each other, but not with the other three tone letters, so as not to create spuriously precise distinctions. With this restriction, there are 8 possibilities.[67]

The old staveless tone letters tend to be more restricted than the staved letters, though not as restricted as the diacritics. Officially, they support as many distinctions as the staved letters,[68] but typically only three pitch levels are distinguished. Unicode supports default or high-pitch ⟨ˉ ˊ ˋ ˆ ˇ ˜ ˙⟩ and low-pitch ⟨ˍ ˏ ˎ ꞈ ˬ ˷⟩. Only a few mid-pitch tones are supported (such as ⟨˗ ˴⟩), and then only accidentally.

Although tone diacritics and tone letters are presented as equivalent on the chart, "this was done only to simplify the layout of the chart. The two sets of symbols are not comparable in this way."[69] Using diacritics, a high tone is ⟨é⟩ and a low tone is ⟨è⟩; in tone letters, these are ⟨e˥⟩ and ⟨e˩⟩. One can double the diacritics for extra-high ⟨e̋⟩ and extra-low ⟨ȅ⟩; there is no parallel to this using tone letters. Instead, tone letters have mid-high ⟨e˦⟩ and mid-low ⟨e˨⟩; again, there is no equivalent among the diacritics.

The correspondence breaks down even further once they start combining. For more complex tones, one may combine three or four tone diacritics in any permutation,[60] though in practice only generic peaking (rising-falling) e᷈ and dipping (falling-rising) e᷉ combinations are used. Chao tone letters are required for finer detail (e˧˥˧, e˩˨˩, e˦˩˧, e˨˩˦, etc.). Although only 10 peaking and dipping tones were proposed in Chao's original, limited set of tone letters, phoneticians often make finer distinctions, and indeed an example is found on the IPA Chart.[note 24] The system allows the transcription of 112 peaking and dipping pitch contours, including tones that are level for part of their length.

More complex contours are possible. Chao gave an example of [꜔꜒꜖꜔] (mid-high-low-mid) from English prosody.[67]

Chao tone letters generally appear after each syllable, for a language with syllable tone (⟨a˧vɔ˥˩⟩), or after the phonological word, for a language with word tone (⟨avɔ˧˥˩⟩). The IPA gives the option of placing the tone letters before the word or syllable (⟨˧a˥˩vɔ⟩, ⟨˧˥˩avɔ⟩), but this is rare for lexical tone. (And indeed reversed tone letters may be used to clarify that they apply to the following rather than to the preceding syllable: ⟨꜔a꜒꜖vɔ⟩, ⟨꜔꜒꜖avɔ⟩.) The staveless letters are not directly supported by Unicode, but some fonts allow the stave in Chao tone letters to be suppressed.

IPA diacritics may be doubled to indicate an extra degree of the feature indicated.[70] This is a productive process, but apart from extra-high and extra-low tones ⟨ə̋, ə̏⟩ being marked by doubled high- and low-tone diacritics, and the major prosodic break ⟨‖⟩ being marked as a double minor break ⟨|⟩, it is not specifically regulated by the IPA. (Note that transcription marks are similar: double slashes indicate extra (morpho)-phonemic, double square brackets especially precise, and double parentheses especially unintelligible.)

For example, the stress mark may be doubled to indicate an extra degree of stress, such as prosodic stress in English.[71] An example in French, with a single stress mark for normal prosodic stress at the end of each prosodic unit (marked as a minor prosodic break), and a double stress mark for contrastive/emphatic stress: [ˈˈɑ̃ːˈtre | məˈsjø ‖ ˈˈvwala maˈdam ‖] Entrez monsieur, voilà madame.[72] Similarly, a doubled secondary stress mark ⟨ˌˌ⟩ is commonly used for tertiary (extra-light) stress.[73] In a similar vein, the effectively obsolete (though never retired) staveless tone letters were once doubled for an emphatic rising intonation ⟨˶⟩ and an emphatic falling intonation ⟨˵⟩.[74]

Length is commonly extended by repeating the length mark, as in English shhh! [ʃːːː], or for "overlong" segments in Estonian:

• vere /vere/ 'blood [gen.sg.]', veere /veːre/ 'edge [gen.sg.]', veere /veːːre/ 'roll [imp. 2nd sg.]'
• lina /linɑ/ 'sheet', linna /linːɑ/ 'town [gen. sg.]', linna /linːːɑ/ 'town [ine. sg.]'

(Normally additional degrees of length are handled by the extra-short or half-long diacritic, but the first two words in each of the Estonian examples are analyzed as simply short and long, requiring a different remedy for the final words.)

Occasionally other diacritics are doubled:

• Rhoticity in Badaga /be/ "mouth", /be˞/ "bangle", and /be˞˞/ "crop".[75]
• Mild and strong aspirations, [kʰ], [kʰʰ].[note 27]
• Nasalization, as in Palantla Chinantec lightly nasalized /ẽ/ vs heavily nasalized /e͌/,[76] though in extIPA the latter indicates velopharyngeal frication.
• Weak vs strong ejectives, [kʼ], [kˮ].[77]
• Especially lowered, e.g. [t̞̞] (or [t̞˕], if the former symbol does not display properly) for /t/ as a weak fricative in some pronunciations of register.[78]
• Especially retracted, e.g. [ø̠̠] or [s̠̠],[79][70][80] though some care might be needed to distinguish this from indications of alveolar or alveolarized articulation in extIPA, e.g. [s͇].
• The transcription of strident and harsh voice as extra-creaky /a᷽/ may be motivated by the similarities of these phonations.

There are various punctuation-like conventions for linguistic transcription that are commonly used together with IPA. Some of the more common are:

⟨*⟩

(a) A reconstructed form.

(b) An ungrammatical form (including an unphonemic form).

⟨**⟩

(a) A reconstructed form, deeper (more ancient) than a single ⟨*⟩, used when reconstructing even further back from already-starred forms.

(b) An ungrammatical form. A less common convention than ⟨*⟩ (b), this is sometimes used when reconstructed and ungrammatical forms occur in the same text.[90]

⟨×⟩

An ungrammatical form. A less common convention than ⟨*⟩ (b), this is sometimes used when reconstructed and ungrammatical forms occur in the same text.[91]

⟨?⟩

A doubtfully grammatical form.

⟨%⟩

A generalized form, such as a typical shape of a wanderwort that has not actually been reconstructed.[92]

⟨#⟩

A word boundary – e.g. ⟨#V⟩ for a word-initial vowel.

⟨$⟩

A phonological word boundary; e.g. ⟨H$⟩ for a high tone that occurs in such a position.

Full capital letters are not used as IPA symbols, except as typewriter substitutes (e.g. N for ⟨ŋ⟩, S for ⟨ʃ⟩, O for ⟨ɔ⟩ – see SAMPA). They are, however, often used in conjunction with the IPA in two cases:

1. for (archi)phonemes and for natural classes of sounds (that is, as wildcards). The extIPA chart, for example, uses capital letters as wildcards in its illustrations.
2. as carrying letters for the Voice Quality Symbols.

Wildcards are commonly used in phonology to summarize syllable or word shapes, or to show the evolution of classes of sounds. For example, the possible syllable shapes of Mandarin can be abstracted as ranging from /V/ (an atonic vowel) to /CGVNᵀ/ (a consonant-glide-vowel-nasal syllable with tone), and word-final devoicing may be schematized as C → C̥/_#. In speech pathology, capital letters represent indeterminate sounds, and may be superscripted to indicate they are weakly articulated: e.g. [ᴰ] is a weak indeterminate alveolar, [ᴷ] a weak indeterminate velar.[93]

There is a degree of variation between authors as to the capital letters used, but ⟨C⟩ for {consonant}, ⟨V⟩ for {vowel} and ⟨N⟩ for {nasal} are ubiquitous. Other common conventions are ⟨T⟩ for {tone/accent} (tonicity), ⟨P⟩ for {plosive}, ⟨F⟩ for {fricative}, ⟨S⟩ for {sibilant},[note 36] ⟨G⟩ for {glide/semivowel}, ⟨L⟩ for {lateral} or {liquid}, ⟨R⟩ for {rhotic} or {resonant/sonorant},[note 37] ⟨₵⟩ for {obstruent}, ⟨Ʞ⟩ for {click}, ⟨A, E, O, Ɨ, U⟩ for {open, front, back, close, rounded vowel}[note 38] and ⟨B, D, Ɉ, K, Q, Φ, H⟩ for {labial, alveolar, post-alveolar/palatal, velar, uvular, pharyngeal, glottal[note 39] consonant}, respectively, and ⟨X⟩ for {any sound}. The letters can be modified with IPA diacritics, for example ⟨Cʼ⟩ for {ejective}, ⟨Ƈ ⟩ for {implosive}, ⟨N͡C⟩ or ⟨ᴺC⟩ for {prenasalized consonant}, ⟨Ṽ⟩ for {nasal vowel}, ⟨CʰV́⟩ for {aspirated CV syllable with high tone}, ⟨S̬⟩ for {voiced sibilant}, ⟨N̥⟩ for {voiceless nasal}, ⟨P͡F⟩ or ⟨Pꟳ⟩ for {affricate}, ⟨Cʲ⟩ for {palatalized consonant} and ⟨D̪⟩ for {dental consonant}. ⟨H⟩, ⟨M⟩, ⟨L⟩ are also commonly used for high, mid and low tone, with ⟨LH⟩ for rising tone and ⟨HL⟩ for falling tone, rather than transcribing them overly precisely with IPA tone letters or with ambiguous digits.[note 40]

Typical examples of archiphonemic use of capital letters are ⟨I⟩ for the Turkish harmonic vowel set {i y ɯ u};[note 41] ⟨D⟩ for the conflated flapped middle consonant of American English writer and rider; ⟨N⟩ for the homorganic syllable-coda nasal of languages such as Spanish and Japanese (essentially equivalent to the wild-card usage of the letter); and ⟨R⟩ in cases where a phonemic trill /r/ and flap /ɾ/ are indeterminate, as in Spanish enrejar /eNreˈxaR/ (the n is homorganic and the first r is a trill but the second is variable).[94] Similar usage is found for phonemic analysis, where a language does not distinguish sounds that have separate letters in the IPA. For instance, Castillian Spanish has been analyzed as having phonemes /Θ/ and /S/, which surface as [θ] and [s] in voiceless environments and as [ð] and [z] in voiced environments (e.g. hazte /ˈaΘte/, → [ˈaθte], vs hazme /ˈaΘme/, → [ˈaðme]; or las manos /laS ˈmanoS/, → [lazˈmanos]).[95]

⟨V⟩, ⟨F⟩ and ⟨C⟩ have completely different meanings as Voice Quality Symbols, where they stand for "voice" (generally meaning secondary articulation, as in ⟨Ṽ⟩ "nasal voice", not phonetic voicing), "falsetto" and "creak". They may also take diacritics that indicate what kind of voice quality an utterance has, and may be used to extract a suprasegmental feature that occurs on all susceptible segments in a stretch of IPA. For instance, the transcription of Scottish Gaelic [kʷʰuˣʷt̪ʷs̟ʷ] 'cat' and [kʷʰʉˣʷt͜ʃʷ] 'cats' (Islay dialect) can be made more economical by extracting the suprasegmental labialization of the words: Vʷ[kʰuˣt̪s̟] and Vʷ[kʰʉˣt͜ʃ].[96] The usual wildcard X or C might be used instead of V so that the reader does not misinterpret ⟨Vʷ⟩ as meaning that only vowels are labialized (i.e. Xʷ[kʰuˣt̪s̟] for all segments labialized, Cʷ[kʰuˣt̪s̟] for all consonants labialized), or the carrier letter may be omitted altogether (e.g. ʷ[kʰuˣt̪s̟]). (See § Suprasegmentals for other transcription conventions.)

Representations of consonant sounds outside of the core set are created by adding diacritics to letters with similar sound values. The Spanish bilabial and dental approximants are commonly written as lowered fricatives, [β̞] and [ð̞] respectively.[note 42] Similarly, voiced lateral fricatives would be written as raised lateral approximants, [ɭ˔ ʎ̝ ʟ̝]; extIPA provides ⟨𝼅⟩ for the first of these. A few languages such as Banda have a bilabial flap as the preferred allophone of what is elsewhere a labiodental flap. It has been suggested that this be written with the labiodental flap letter and the advanced diacritic, [ⱱ̟].[98] Similarly, a labiodental trill would be written [ʙ̪] (bilabial trill and the dental sign), and labiodental stops [p̪ b̪] rather than with the ad hoc letters sometimes found in the literature. Other taps can be written as extra-short plosives or laterals, e.g. [ ɟ̆ ɢ̆ ʟ̆], though in some cases the diacritic would need to be written below the letter. A retroflex trill can be written as a retracted [r̠], just as non-subapical retroflex fricatives sometimes are. The remaining consonants – the uvular laterals ([ʟ̠] etc.) and the palatal trill – while not strictly impossible, are very difficult to pronounce and are unlikely to occur even as allophones in the world's languages.

The vowels are similarly manageable by using diacritics for raising, lowering, fronting, backing, centering, and mid-centering.[99] For example, the unrounded equivalent of [ʊ] can be transcribed as mid-centered [ɯ̽], and the rounded equivalent of [æ] as raised [ɶ̝] or lowered [œ̞] (though for those who conceive of vowel space as a triangle, simple [ɶ] already is the rounded equivalent of [æ]). True mid vowels are lowered [e̞ ø̞ ɘ̞ ɵ̞ ɤ̞ o̞] or raised [ɛ̝ œ̝ ɜ̝ ɞ̝ ʌ̝ ɔ̝], while centered [ɪ̈ ʊ̈] and [ä] (or, less commonly, [ɑ̈]) are near-close and open central vowels, respectively. The only known vowels that cannot be represented in this scheme are vowels with unexpected roundedness, which would require a dedicated diacritic, such as protruded ⟨ʏʷ⟩ and compressed ⟨uᵝ⟩ (or protruded ⟨ɪʷ⟩ and compressed ⟨ɯᶹ⟩).

Unicode supports nearly all of the IPA alphabet. Apart from basic Latin and Greek and general punctuation, the primary blocks are IPA Extensions, Spacing Modifier Letters and Combining Diacritical Marks, with lesser support from Phonetic Extensions, Phonetic Extensions Supplement, Combining Diacritical Marks Supplement, and scattered characters elsewhere. The extended IPA is supported primarily by those blocks and Latin Extended-G.

After the Kiel Convention in 1989, most IPA symbols were assigned an identifying number to prevent confusion between similar characters during the printing of manuscripts. The codes were never much used and have been superseded by Unicode.[101]

The sequence ⟨˨˦˧꜒꜔꜓k͜𝼄a͎̽᷅ꟸ⟩ in the fonts Gentium Book Plus, Andika, Brill, Noto Serif and Calibri. All of these fonts align diacritics well. Asterisks are characters not supported by that font. In Noto, the red tone letters do not link properly. This is a test sequence: Noto and Calibri support most IPA adequately.

Many typefaces have support for IPA characters, but good diacritic rendering remains rare.[102] Web browsers generally do not need any configuration to display IPA characters, provided that a typeface capable of doing so is available to the operating system.

The ubiquitous Arial and Times New Roman fonts include IPA characters, but they are neither complete (especially Arial) nor render diacritics properly. The basic Latin Noto fonts are better, only failing with the more obscure characters. The proprietary Calibri font, which is the default font of Microsoft Office, has nearly complete IPA support with good diacritic rendering.

Brill has good IPA support. It is a commercial font but freely available for non-commercial use.[103]

Typefaces that provide nearly full IPA support and properly render diacritics include Gentium Plus, Charis SIL, Doulos SIL, and Andika. In addition to the support found in other fonts, these fonts support the full range of old-style (pre-Kiel) staveless tone letters, which do not have dedicated Unicode support, through an option to suppress the stave of the Chao tone letters.

Several systems have been developed that map the IPA symbols to ASCII characters. Notable systems include SAMPA and X-SAMPA. The usage of mapping systems in on-line text has to some extent been adopted in the context input methods, allowing convenient keying of IPA characters that would be otherwise unavailable on standard keyboard layouts.

IETF language tags have registered fonipa as a variant subtag identifying text as written in IPA.[104] Thus, an IPA transcription of English could be tagged as en-fonipa. For the use of IPA without attribution to a concrete language, und-fonipa is available.

Online IPA keyboard utilities are available, though none of them cover the complete range of IPA symbols and diacritics.[note 44] In April 2019, Google's Gboard for Android added an IPA keyboard to its platform.[105][106] For iOS there are multiple free keyboard layouts available, e.g. "IPA Phonetic Keyboard".[107]