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Jyutping gwai3 zi6 coek3
Pinyin guǐ zì chuō

Definitions (兩岸三地生活差異詞語彙編—Two Shores Three Places)
  1. 郵件運輸:臺
    癸字戳
  2. 郵件運輸:陸
    集郵日戳