Autograph

An autograph was a type of signature, usually written by a famous person to an admirer.

A girl called Ellie asked Amy Pond, by this a model for Petrichor, for an autograph when they met in Sanderson & Grainger, to which Amy happily obliged. (TV: Closing Time)

The Thirteenth Doctor asked actor Errol Flynn for his autograph when she met him in Follyrood. (COMIC: The Greatest Movie Never Made)