Cards, roulette wheels, and slot reels carry casino history in their worn...

https://varimail.com/articles/why-reels-became-the-default-way-to-show-slot-outcomes/

Cards, roulette wheels, and slot reels carry casino history in their worn edges, painted numbers, and moving parts. A roulette wheel’s single-zero layout differs from the double-zero version familiar in many American casinos