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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.
There are different ways of using the clenched hands gesture: some have their hands clenched in front of their faces while sitting and resting their elbows on the table, others rest their clenched hands on the table or their lap while many simply clench their hands in front of their stomach or crotch while standing up.