Clinker brick - Wikipedia
Clinker is sometimes spelled "klinker" which is the contemporary Dutch word for the brick. Both terms are onomatopoeic, derived from the Middle Dutch klinkaerd, later klinker, from klinken ("to ring, resound"). [citation needed]Clinker bricks are also known as Dutch paving bricks. [citation needed] In 18th century New York, the Dutch interspersed dark clinkers with regular bricks.