Separate partitioned area in a public place for a few people WordNet 3.0 & Open English WordNet

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

An overhanging, wall-mounted turret projecting from the walls of mediaeval fortifications Wikipedia Disambiguation

Small turret projecting from the top of towers or parapets Wikidata

A parapet with battlements projecting from the top of a tower in a castle or church. Wiktionary

A projecting turret for a sentry, as at the salient angles of works, or the acute angles of bastions. Wiktionary