[FMadera]

Take this for what it's worth, but here's what I was able to find:

In sports contexts that prohibit artificial noisemakers, the clearest and most widely accepted definition is:

Artificial Noisemaker — Any device or object that is designed, modified, or used to produce sound through mechanical, electronic, or other non-vocal means, for the purpose of creating crowd noise or distraction.

🔍 Expanded Explanation (for rule or policy use):

An artificial noisemaker typically includes, but is not limited to:

Mechanical devices: cowbells, air horns, whistles, clappers, vuvuzelas, thundersticks, drums, or any other hand-operated item designed to amplify or create noise.

Electronic or powered devices: speakers, megaphones, sirens, or electronic sound machines.

Improvised items used to create noise (e.g., banging on metal signs, bottles, or bleachers) if done intentionally to amplify sound beyond normal cheering.

🚫 What is not an artificial noisemaker:

Normal vocal cheering, chanting, or singing by fans.

Applause or noise made incidentally by stomping, clapping, or reacting naturally to play (unless specifically restricted by venue rules).