The gavel is a small wooden mallet long used by judges, auctioneers, and meeting chairs to call a room to order and mark a decision as final. Its sharp knock became familiar far beyond the courtroom through film and television courtroom scenes, where it signals that a trial has ended or a ruling has been made. Online, the same sound was adopted by meme makers and short-form creators as a quick shorthand for authority and finality, and it remains popular because almost everyone recognises it instantly without any explanation.