OB可以是下列意思:

  • OB是俄國羔皮航線(Astrakhan Airlines)的IATA碼。
  • 方尖碑(obelisk)
  • 畢業生,學長(和製英語:Old Boy),也是棒球老童隊的隊名
  • 公開測試(Open Beta)
  • 韓國東方釀造(Oriental Brewery)的簡寫。
  • 在某些電競比賽中死亡後可觀戰隊友,及時留意並提醒隊友有敵人和敵人方位(引用至《AWM絕地求生》)

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