ELF is an acronym which refers to extremely low frequency electromagnetic radiation, a subclass of electromagnetic radiation sometimes referred to as slow wave electromagnetic radiation. A scalar is a special type of waveform emitted by natural bodies (usually planets, moons or stars) and devices which emit ELF radiation.

ELFs are emitted by a wide range of devices that use electricity, ranging from computer chips to household electrical wiring. ELFs are not necessarily harmful. In fact the Earth's own 6.13Hz ELF emission is believed by many researchers to be so vital to the health of plants and animals that the disruption or absence of this emission can result in abnormalities and health problems. Disruptions in natural ELF radiation and low levels of artificial ELF, both of which are produced by electronic devices such as computer processing chips, are not widely believed to pose significant risks to human health, but devices which allege to protect against ELF radiation, or restore a natural 6.13Hz environmental ELF, have been gaining in popularity since the mid-1980s. There is little long-term research to support any claims of hazard associated with these emissions.

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