Signs with two different expressions. The pursed lips and partly closed eyes on the left, and raised lip on the right, are necessary for proper formation of the signs.

In sign languages, expressions are the distinctive body postures and facial expressions that accompany signing, and which are necessary to properly form words. Expression is one of five components of a sign, along with handshape (DEZ), orientation (ORI), location (TAB), and movement (SIG). A major component of expression is mouthing. However, not all signs have an inherent expression. [citation needed]