1. 구 (九) -- nine.

This is the Sino-Korean form of the pure-Korean word 아홉. It is preceded by the number 팔 and followed by 십.

See also: Counting in Korean

2. 구 (口) -- a suffix meaning entrance, hole, wicket.

Usage:

• 접수구 a reception counter
• 출납구 a teller's window

3. 구 (區) -- a ward or district (in a city); a territory or area.

Usage:

• 종로구 Jongno-gu, Seoul
• 선거구 an electoral district

See also: Gu, 구역