(1) (
Extremely
Low
Frequency) See
frequency bands.
(2) (
Executable and
Linkable
Format) A file format for Unix executable programs. Introduced with System V Release 4 (SVR4) in 1989, ELF is also the standard for running Unix programs on x86 machines. ELF32 and ELF64 are the 32-bit and 64-bit versions of the format.