ELF

ELF (uncountable)

1. (computing) Initialism of Executable and Linking Format (a common object file format for Unix)
   • 2016, Ryan "elfmaster" O'Neill, Learning Linux Binary Analysis (page 97)

     In ELF executables, there aren't a whole lot of code caves (such as in the PE format), so you are not likely to be able to shove more than just a meager amount of shellcode into existing code slots […]

2. (electronics) Initialism of extremely low frequency (band of radio frequencies from 3 to 30 hertz)
3. (linguistics) Initialism of English as a Lingua Franca.

• (electronics) LF, VLF

• (electronics) LW, MW, RF, SW

ELF

1. Initialism of Earth Liberation Front (a radical environmentalism group)
2. Initialism of Elvish Linguistic Fellowship (an organization that studies the invented languages of J. R. R. Tolkien)
3. Initialism of Endangered Language Fund (a non-profit organization)

• EFL