As per Wikipedia, “Jazz Hands is a common gesture often used in theatre and dance. To perform Jazz Hands, one’s hands are opened with palms facing forward and the fingers are splayed.
The Hands may then be shaken slightly, as if holding a tambourine. However, this is not a necessary part of the Jazz Hands action*.”
The lesser known, though no less expressive, cousin of Jazz Hands is the Jazz Confusion Face. Though not a standard of the theatre set, Jazz Confusion Face is often utilised by befuddled engineers, generally while wearing a hard hat (see below). The most distinctive features of the Jazz Confused Face is not the splaying of hands, but rather a pursing of the lips and furrowing of the brow.
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Both Jazz Hands and Jazz Confused Face can be prompted upon hearing Fosse, though for wildly different reasons.
*DoL disagrees, and feels that there is no Jazz in the Hands without the slight shaking.
