queen closer

[ kloh-zer ]
/ ˈkloʊ zɛr /

noun Masonry.

a brick of normal length and thickness but of half normal width, used to complete a course or to space regular bricks.
a brick of half the usual length, for completing a course or for spacing regular bricks.
Also called queen closure.
Compare king closer.

Origin of queen closer

First recorded in 1835–45