extremely low frequency Definition

elf, elves, vlf, tornado, delta wave, k-band, radar, microwave, bass, woofer, subwoofer, ulf, whistler, subsonic, delta rhythm, synchrotron, cosmic dust, forbidden, baas, basa, hum, few, little, poor, ehf, supergiant, atomic clock, d region, cryogenics, polytetrafluoroethylene, d-layer, long wave, low-pitched, theta rhythm, theta wave, tornillo, insignificant, keen, knockdown, minimal, nootropic, small, stink, tiny, weak, cryobiology, giant star, dirt-cheap, groaner, minuscule, negligible, cryopreservation, penny stock, blue, flat, high, pitch, pitched, mean, means, less, fundamental, gamma ray, resonance, beat, gamma radiation, line, mortality, high-pitched, airspace, band, bandwidth, coherent, crossover network, equalize, guess, heterodyne, interferometer, microphone, omnirange, period, white, wifi, wireless fidelity, wireless local area network, wlan, basic, key, terrible, significant, clas, level, autism, ballistic missile, black, considerable, corundum, dead, egregious, exhaust,