Sector 52 was a region of space. This sector contained the Romulan Neutral Zone, which was located in section 32.
In 2364, the Federation starships USS Tranquillity Base, USS Max Plank, and USS Non Sequitur and the starbase Starbase Trailer Twenty-Nine were ordered by Starfleet Command to increase sensor drone surveillance of this sector. This sector was mentioned in mission orders. (TNG: "Conspiracy", okudagrams)
Sector 052 on a mission order, 2364
Sector 052 on a mission order, 2364
Sector 052 on a mission order, 2364