鏰子 [镚－]

Jyutping bang1 zi2
Pinyin bèng zi

Definitions (Wiktionary)
  1. noun, historical
    small copper coin without holes during the late Qing dynasty
    (syn.) 鏰兒, 镚儿
  2. noun, broadly, colloquial
    small coin
    (syn.) 鏰兒, 镚儿