# extremely low frequency

> the 3–30 Hz range of the electromagnetic spectrum

**Wikidata**: [Q741979](https://www.wikidata.org/wiki/Q741979)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Extremely_low_frequency)  
**Source**: https://4ort.xyz/entity/extremely-low-frequency


## References

1. Nomenclature of the frequency and wavelength bands used in telecommunications (08/2015)
2. [Source](https://github.com/JohnMarkOckerbloom/ftl/blob/master/data/wikimap)
3. Nomenclature of the frequency and wavelength bands used in telecommunications
4. Freebase Data Dumps. 2013
5. National Library of Israel Names and Subjects Authority File
6. [OpenAlex](https://docs.openalex.org/download-snapshot/snapshot-data-format)