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:

Colonies

• Sigma III colony

Planets

• Quadra Sigma III
• Sigma Draconis I
• Sigma Draconis II
• Sigma Draconis III
• Sigma Draconis IV
• Sigma Draconis V
• Sigma Draconis VI
• Sigma Draconis VII
• Sigma Draconis VIII
• Sigma Draconis IX
• Sigma Iotia II

Star systems

• Sigma III system
• Sigma Draconis system
• Sigma Erandi system
• Sigma Nelvana system

Starfleet terminology

• Sigma 9 clearance, a top-level security clearance

Stars

• Sigma Draconis
• Sigma Nelvana
• Sigma Nesterowitz

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