马甲

mǎ jiǎ

corset

sockpuppet (Internet slang); vest (dialect)

马

mǎ

abbr. for Malaysia 馬來西亞|马来西亚[Ma3 lai2 xi1 ya4]

甲

jiǎ

first of the ten Heavenly Stems 十天干[shi2 tian1 gan1]