(written from a Production point of view)
According to the script for "Business as Usual", the T'Pan was a Vulcan science vessel that visited Deep Space 9 in 2373. After a request to dock at the space station, the vessel was assigned to Docking Bay Three. The pronunciation of T'Pan was "tuh-PAWN". The scene in which the T'Pan was mentioned did not make it into the final episode.