伯公火 [－－－]

Jyutping baak3 gung1 fo2
Pinyin bó gōng huǒ

Definitions (Wiktionary)
  1. noun, Hakka
    will o' the wisp; ignis fatuus
    (syn.) 磷火, 鬼火, 陰火, 阴火, 鬼仔火