A Cardassian officer rank immediately below gul, usually held by the aides and first officers of commanders, such as Daro and Telle in The Wounded and Damar under Dukat.
Glinn is a Cardassian military rank junior to gul. A glinn commonly acts as the executive officer or aide to a gul, much as a commander serves a captain in Starfleet. Below it comes the rank of gil.
The rank appears with the Cardassians themselves in The Next Generation episode The Wounded, in which Glinn Daro and Glinn Telle accompany Gul Macet aboard the Enterprise-D. Daro's attempt at friendship with Miles O'Brien and Telle's unauthorised use of a computer terminal both feed the tension of the episode.
In Deep Space Nine the best-known glinn is Damar, who is introduced in Return to Grace as an officer on the freighter Groumall under Dukat. He stays at Dukat's side as he rises and in time becomes leader of Cardassia himself.