by Ciro Santilli (@cirosantilli, 25)
Notably used for communication with submarines, so in particular crucial as part of sending an attack signal to that branch of the nuclear triad.

Ancestors

  1. Electromagnetic spectrum
  2. Light
  3. Photon
  4. Elementary particle
  5. Subatomic particle
  6. Standard Model
  7. Particle physics
  8. Physics
  9. Natural science
  10. Science
  11. Index

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