USS Sentinel

From Memory Alpha, the free Star Trek reference.

The USS Sentinel was a Federation starship during the 24th century.

While visiting Deep Space 9 during the Dominion War in 2375, the Sentinel listed a surplus graviton stabilizer on its manifest. Nog, acting on behalf of Chief O'Brien who needed the stabilizer for the USS Defiant, secured the unit in a complicated trade that brought a phaser emitter from the USS Musashi. (DS9: "Treachery, Faith and the Great River")

Apocrypha

The starship class of the Sentinel is not known, but the games Star Trek: Invasion and Star Trek: Armada portray it as a Sovereign-class starship, while Pocket Books' Star Trek: SCE, War Stories, Book I states the starship belongs to the Akira-class and that Lt. Commander Sonya Gomez served aboard the vessel during the Dominion War.

In the Star Trek: Starfleet Academy game, the Sentinel is a Miranda-class starship and crosses the Klingon neutral zone without authorization and engages two Klingon Birds-of-Prey after it is believed that the Klingons are responsible for the mysterious destruction of a Federation colony.