Babel

Babel is the code name for a planetoid in neutral space, used by the United Federation of Planets as venue for conferences. Relative to Tellar Prime, it is located on the opposite side of Andorian space.

The planetoid was planned to host negotiations between the Andorians and the Tellarites mediated by the Humans in 2154. However, the meeting was postponed due to tensions between the two powers caused by a raiding Romulan scout vessel in the area. (ENT: "Babel One")

In 2268, the Babel Conference was held there, which was to determine Coridan's admission to the Federation. (TOS: "Journey to Babel")

In 2270, the USS Enterprise transported Commodore Robert April and his wife Sarah to Babel, where ambassadors from all Federation worlds had converged to honor April as he had reached his mandatory retirement age. (TAS: "The Counter-Clock Incident")

Probably Babel belongs to Class D, according to Star Trek: Star Charts. Babel was also mentioned as a small note on a very large star chart graphic created for TNG: "Conspiracy". It was the image behind the chair in the room where Dexter Remmick was killed.