When laying bricks, the manner in which the bricks overlap is called the bond. A brick laid with the longest side exposed is called a stretcher brick, as opposed to a header, where only the smallest end of the brick is exposed to the weather. The length of one stretcher is the same as two header bricks, side-by-side, including the 10mm joint between.
The thickness of a brick wall is measured using a unit of length known as 'the brick'. This standard can be used consistently with the wide variety of brick sizes available ("modular, "Norman" brick, etc.). The length of the longest face for a particular size of brick equals "one brick", for the purposes of measuring a wall built from such bricks.
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