Whirligig is a generic name for an object that spins or whirls (or has whirling parts). The term may specifically refer to one of the following

Whirligig , a Paul Fleischman's book telling a story about a teenager who builds whirligigs as a way to repay the mother of a girl he killed in a drunk driving accident.

Whirligig beetle

Whirligig (torture)

Samara, fruit falling in spiral (from ash trees).

Whirl-Y-Gig, a London club