Brigadier general

Brigadier General is a military officer's rank, the equivalent of which is used by the service organizations of many civilizations. As a traditional grade, brigadier General (sometimes shortened to brigadier) is the most junior flag officer rank of a fighting organization, by definition it is the officer in charge of a brigade. In comparison to naval ranking systems, this rank is equivalent to the naval Commodore (or Rear Admiral lower half) ranks.

From Memory Alpha -- the free Star Trek reference