From Halopedia, the Halo wiki
Chur'R is a Kig-Yar title that indicates the commander of a ship, roughly the equivalent of captain or shipmaster. Often used alongside the title of shipmaster or shipmistress, Kig-Yar captains may have their names prefixed with the Chur'R title, such as Chur'R-Yar. The title has only been observed among female shipmistresses.
List of appearances