An external corner in brick masonry is called a

Why is this the answer?

In brick masonry, a quoin is the brick forming an external corner of a wall. Quoin bricks alternate between adjacent walls at each course to provide structural interlocking. They are often of superior quality and prominently dressed. A jamb is the side face of a door or window opening; a reveal is the visible side surface of a recess. External corner brick is quoin.

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