Algol system
The Algol system was a star system in the Alpha Quadrant. It contained five planets, including the inhabited warp-capable world of Algol I.  Nearby inhabited star systems included the Talar, Galen, Kiley, Gamma Trianguli, Alpha Majoris, and Scalos systems.

By 2259, the Federation had established first contact with this system and could visit it freely. That year, the location of this system was labeled on a stellar cartography chart that was seen on the 's ready room viewscreen. The system's symbol had a blue color, indicating that it was affiliated with the Federation. ()

In 2399, the location of this system in neutral space was labeled on a Federation star chart in Fleet Admiral Kirsten Clancy's office at Starfleet Headquarters. () 

In 3189, the location of this system was denoted on a holographic star chart of the galaxy at Federation Headquarters. ()

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Star systems