Triton

Triton is a Colonial battlestar, destroyed during the Cylon Holocausts in both series.

The Re-imagined Series

Battlestar Triton, featuring integrated command and control systems, and featuring Dr. Gaius Baltar's Command Navigation Program (CNP) is reported as lost with many other battlestars of the Colonial Fleet during the Cylon Attack, along with the Columbia and Solaria (Miniseries).

It is possible that Crashdown escaped the destruction of the battlestar and made it to Ragnar Anchorage, since Boomer refers to him as "a refugee from Triton" (33).

In the Re-imagined Series, the battlestar is likely named after one of the Lords of Kobol or a supported figure in Colonial faith, given the parallels to the Colonial faith and the pantheon of Greek gods.

The Original Series

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5 Battlestars at Cimtar (credit: Universal / ABC)

Though not specifically seen on screen, the battlestar Triton is mentioned when the Cylons attack the fleet at Cimtar (Saga of a Star World).

It's likely Acropolis and Pacifica are the other unnamed battlestars seen with the Atlantia and Galactica at Cimtar.