For questions about the TV show "Stargate Universe" (SGU for short) which ran from 2009 to 2011. Always use in conjunction with the [stargate] tag.

Stargate: Universe (SGU) is a 2-season live-action TV series set in the Stargate universe that sees a multinational exploration team trying to return to Earth after being stranded on an Ancient starship called Destiny.

The series was a much grittier, more realistic and character-driven show than both SG-1 and Atlantis as the resource-poor team struggle to gain control of the extremely-old, barely-functional ship, fight off advanced alien races and clash with each other.

Questions specific to Stargate: Universe should use the tag. Always use with the tag.
For questions that encompass the entire canon or multiple series, the tag should be used.