king closer

or king closure

[kloh-zer]

noun Masonry.

a brick of regular length and thickness, used in building corners, having a long bevel from a point on one side to one about halfway across the adjacent end.
a brick of three-quarter length for finishing a course at the end.

Compare queen closer.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019