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Jazz hands. Jazz hands in performance dance is the extension of a performer's hands with palms toward the audience and fingers splayed (this position is also referred to as webbing). It is commonly associated with especially exuberant types of performance such as musicals, cheerleading, show choir, revue, and especially jazz dance shows.
Human hands are the most universally recognized example of chirality: the left hand is a non-superposable mirror image of the right hand; no matter how the two hands are oriented, it is impossible for all the major features of both hands to coincide.