Letters that make ELF
e, f, l are letters that make 'ELF'
delf, pelf, selfs, self are words created by adding a letter to 'ELF'
1 possible definitions for 'ELF'
Under this definition, elf is a noun and has the following properties:
extremely low frequency has the same meaning as ELF
'ELF' can be a type of radio frequency.
'ELF' can be a part of electromagnetic spectrum.