白旄黃鉞 [－－黄钺]

Jyutping baak6 mou4 wong4 jyut6
Pinyin bái máo huáng yuè

Definitions (CC-CEDICT)
  1. white banner and yellow battle-ax (idiom); refers to military expedition
Definitions (Wiktionary)
  1. noun, archaic
    white banners and gilded axes (signifying the start of a military expedition)