District

Frequent enough that you will keep running into it once you read past headlines.

More common than 省 (Conserve), less common than 衛 (Defense).

A cage (匸) holds a treasure (丶メ) — the district is a caged-off section of the city where valuable things are kept.

In words

区く ward;district;sectionN1

区々まちまち 1. several;various;divergent;conflicting;different;diverse; 2. trivialN1

区別くべつ distinction,differentiation,classificationN3

区 is rank 429 of 2,608 in published Japanese.