Stack is a term used in casinos to refer to a stack of casino chips. Rather straightforward, isn’t it?
Most often, a stack of chips is comprised of 20 or more casino chips. However, keep in mind that there is no set number that defines a stack, so you are free to use the term liberally. Furthermore, the denomination of the chips doesn’t matter when using the term as long as there is a handful of them.
While the term is commonly used in a game of roulette, players tend to use it in all casino games that involve casino chips as currency. It is one of the most used terms in land-based casinos, so chances are that you will hear it quite often.