Si Collection, Middle Volume Radical: Fire (huǒ) Wo Kangxi strokes: 14 Page 680, Entry 04 According to the Dictionary of Five Sounds and Seas (Wuyin Pianhai), it is pronounced wu. According to the Supplement to the Collection of Characters (Zihuibu), it means the extinguishing of fire. There is also a pronunciation of wu, pronounced like the character for the surname Wu, with the same meaning.