號砲 [号－]

Jyutping hou6 paau3
Pinyin hào pào

Definitions (Wiktionary)
  1. noun, archaic
    a signal flare; a cannon used for signaling purposes (in battle)

號砲 [号炮]

Jyutping hou6 paau3
Pinyin hào pào

Definitions (CC-CEDICT)
  1. cannon used for signaling
  2. signaling shot