Name that mark: the “approval curl”

Bas Jacobs of the European type foundry Underware wrote to Shady Characters with a question: what is this character? It is used to mark correct exam answers in the same way as a tick or check mark, but beyond that its name or derivation is not clear. Bas is no stranger to unusual symbols, being the creator of Underware’s lightning-bolt irony mark, but both he and I are stumped. Here are his thoughts thus far:

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