Mao (矛)

Drawing of a Mao, from 'Deng Tang Bi Jiu (《登堂必究》)'.

The Mao (矛, spear) is simply another name for Qiang (鎗). There is no functional difference between a Mao and a Qiang, in fact both terms can be used interchangeably to refer to the same weapon. Nevertheless, Mao is sometimes used to designate a specific type of spear with a snake-like, curvy spearhead, colloquially known as She Mao (蛇矛, snake spear).