Shift key

Keyboard of a German mechanical typewriter (early 20th century), with shift keys labelled “Umschalter” (“switch”)

Keyboard symbol for “Level 2 Select” (i.e. “Shift”)

The keyboard symbol for the Shift key (which is called Level 2 Select key in the international standard series ISO/IEC 9995) is given in ISO/IEC 9995-7 as symbol 1, and in ISO 7000 “Graphical symbols for use on equipment” as a directional variant of the symbol ISO-7000-251. In Unicode 6.1, the character approximating this symbol best is U+21E7 upwards white arrow (⇧).[3] This symbol is commonly used to denote the Shift key on modern keyboards (especially on non-US layouts and on the Apple Keyboard), sometimes in combination with the word “shift” or its translation in the local language. This symbol also is used in texts to denote the shift key.

On computer keyboards, as opposed to typewriter keyboards, the shift key can have many more uses:

• It is sometimes used to modify the function keys. Modern Microsoft Windows keyboards typically have only 12 function keys; Shift+F1 must be used to type F13, Shift+F2 for F14, etc.
• It can modify various control and alt keys. For example, if Alt-Tab is used to cycle through open windows, Shift-Alt-Tab cycles in the reverse order, and using Ctrl-Shift-S could open a "Save as…" dialogue allowing to choose a new file name and directory instead of overwriting the current file.
• In most graphical systems using a mouse and keyboard, the shift key can be used to select a range. For example, if a file is selected in a list, shift-clicking on a file further down the list will select the files clicked on plus the ones inbetween. Similarly, when editing text a shift-click will select the text between the click point and the text cursor.
• The shift key can be used in conjunction with the arrow keys to select text.
• Holding shift while drawing with the mouse in graphics programs generally confines the shape to a straight line, usually vertically or horizontally, or to draw squares and circles using the rectangle and ellipse tools, respectively.
• The shift key can also be used to modify the mouse behavior on a computer. For example, holding shift while clicking on a link in a web browser might cause the page to open in a new window, or to be downloaded.
• In some web browsers, holding shift while scrolling will scan through previously viewed web pages.
• In mostly Pinyin Input Method, Shift key usually use to switch between Chinese and lowercase English.
• In older versions of macOS (10.12 Sierra and below), holding shift while performing certain actions, such as minimising a window or enabling/disabling Dashboard or Mission Control, makes the animation occur in slow motion. For some animations, holding control will make the animation move just slightly slower, and holding control+shift will result in an extremely slow motion animation.
• Pressing either shift key when either the screen is blank and/or the computer is asleep will wake the computer.

On some keyboards, if both shift keys are held down simultaneously only some letters can be typed. For example, on the Dell keyboard Model RT7D20 only 16 letters can be typed. This phenomenon is known as "masking" and is a fundamental limitation of the way the keyboard electronics are designed.[4]

The following is a list of actions involving the shift key for the Microsoft Windows operating system.

• AltGr key
• Command key
• Option key
• StickyKeys