Drow Sign Langauge

Drow Sign Language is a silent hand code used to communicate in the Underdark. Unlike other languages that must be heard to be comprehended, Drow Sign must be seen to gather meaning. It has no alphabet or written form. Humans and other goodly races often confused the language's motions as spell conjurations. Drow Sign Language is commonly known by drow, who find it particularly useful on patrols and in other instances when silence is expedient. It is a very expressive language, able to convey tone and emotions.   Signing drow sometimes disguised their signing with what is called a "visual code of silence": holding up part of one's cloak with one hand in order to shield the signing hand.