Bartizan

A bartizan (an alteration of bratticing), also called a guerite, garita, or échauguette, or spelled bartisan, is an overhanging turret projecting from the walls of late-medieval and early-modern fortifications from the early 14th century up to the 18th century.

[1] Most frequently found at corners, they protected a warder and enabled him to see his surroundings.

[2] The turret was usually supported by stepped masonry corbels and could be round, polygonal or square.

[3][4] Bartizans were incorporated into many notable examples of Scottish Baronial architecture.

In the architecture of Aberdeen, the new Town House, built in 1868–74, incorporates bartizans in the West Tower.