koban

noun2

1. •
   A small community police office or a police box, especially one in Japan.

   • Personnel of kobans change each shift; they report for duty at a police station and fan out to the kobans. — 1976
2. •
   An oval gold coin in the Edo period of feudal Japan.

   • Every landlord hath two koban paid him for dinner, and three for supper and lodgings at night. — 1906