Three Sisters
- Major Orion Syndicate organization in the mid-22nd century (ENT Novel: A Choice of Futures)
- By 2165, they lead the entire syndicate (ENT Novel: Uncertain Logic)
- Named after leadership: Navaar, D'Nesh, and Maras
- Heavily involved in various attempts to destabilize Sol-local space
- Encouraging Federation aggression during the Vertian Crisis (ENT Novel: A Choice of Futures)
- Interfering with pursuit of Federation membership by United Worlds and Colonies of Rigel (ENT Novel: Tower of Babel)
- Supporting Maltuvis's domination of Sauria to encourage negative Federation opinion (ENT Novel: A Choice of Futures, Patterns of Interference)
- Pushing support for Federation isolationism following the collapse of the Consortium of Worlds (ENT Novel: Patterns of Interference)