it means united star ship or united space ship. if you are referring to the star trek series that is. --188.8.131.52 12:24, 20 May 2009 (UTC)amori aiyanna leelanee--184.108.40.206 12:24, 20 May 2009 (UTC)
This doesn't fit with Star Trek but it stands for United States Ship in reality.
In the Star Trek Franchise no one has really made their mind up.