plural of Q-value

A measure of the communicative utility of a human language, computed as the product of the language's centrality and its prevalence.

(chemistry) An allotrope of carbon that is superhard, ferromagnetic and electroconductive.

plural of Q-ship

plural of Q clearance

Synonym of Q-ship / (slang) An unmarked police car carrying plainclothes police officers.

plural of Q-boat

(military) A merchant ship with concealed weaponry, designed to lure submarines into making surface attacks.

(US) A security clearance issued by the United States Department of Energy, allowing access to top-secret material.

plural of Q-ball