Red sector
Red sector was a section aboard Raptor-class scout ships.
While a landing party from Enterprise NX-01 attempted to rescue the crew of the IKS Somraw in 2151, trapped in the atmosphere of a gas giant, Ensign Hoshi Sato pointed out their location on a display near where they docked, and translated the language, which she determined to be Klingon, to point out that they were located on deck two, red sector. (ENT: "Sleeping Dogs")