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Σσ Sigma is a letter in the Greek language alphabet of Earth, originating in the early period of Human history.

It was used in the following contexts:

Astronomical objects
Colony
Planets
Star systems
Starfleet terminology
  • Sigma 9 clearance, a top-level security clearance
Star
Other
In the real world, the signma symbol represents teamwork for NASA's mission control team. (Star Trek Encyclopedia (4th ed., vol. 2, p. 92))
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