Sector 21602

From Memory Alpha, the free Star Trek reference.

Sector 21602, along with sector 22846, are sectors of space where the USS Aries was on missions of deep space exploration in the 2360s, according to a Starfleet report entitled Starship Mission Status. (Star Trek: The Next Generation set decoration)

The assignment of the Aries was not mentioned on screen, but rather was seen on a viewscreen chart on a bridge computer station.