烏牌 [乌－]

Jyutping wu1 paai2
Pinyin wū pái

Definitions (Wiktionary)
  1. noun, Hokkien
    blackboard
    (syn.) 粉枋, 黑牌, 烏枋, 烏板, 粉板 dated, 烏牌, 粉牌, 粉板, 黑板兒, 黑板