king closer

or king closure

noun Masonry.
  1. 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.
  2. a brick of three-quarter length for finishing a course at the end.
Compare queen closer. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018