What Does ELF Stand For?

ELF has more than one possible meaning :

• ELF - Communications System
• ELF - Electron Localization Function
• ELF - Environmental Load Factor
• ELF - Extremely Low Frequency
• ELF - Extremely Low Frequency 1 Hz To 3 KHz

If you know of another acronym for ELF, please suggest it as a new acronym for ELF.