This page contains information regarding Star Trek: Discovery, and thus may contain spoilers.
In 2256, its location was labeled on the star chart "Alpha/Beta Quadrant Overview" in the ready room aboard the USS Discovery. (DIS: "Magic to Make the Sanest Man Go Mad", "The War Without, The War Within")
In 2368, Jean-Luc Picard's blockade fleet retreated to this location to regroup, following the disabling of their tachyon detection grid, seeking to establish a new grid. However, this proved unnecessary as the USS Sutherland detected the Romulan forces by another method. (TNG: "Redemption II")