Coin opening is a term that refers to the small slot or opening that allows someone to insert coins into a vending machine, parking meter, or arcade game. There are several synonyms for this term, including coin slot, coin receptacle, coin inlet, and coin acceptor. Some other common phrases used to describe this opening include coin drop, coin chute, and coin channel. Regardless of the label, the purpose of these openings remains the same: to securely accept coins and enable users to access the machine's services or products. These different terms can be helpful when researching vending machines or troubleshooting issues with coin acceptance.