声呐 Traditional form: 聲吶 Pinyin (reading): shēngnà Definitions: sonar (loanword) Characters: 声 - sound, noise; voice, tone, music 呐 - to raise one's voice; to yell, to shout; to stammer Traditional characters: 聲 - sound, noise; voice, tone, music 吶 - to raise one's voice; to yell, to shout; to stammer