ATM code, also known as Personal Identification Number (PIN), is a unique combination of numbers that is used to authenticate a user's identity while accessing an Automated Teller Machine (ATM). There are several synonyms for ATM code that are commonly used in different regions and cultures. For instance, in the UK, it is often referred to as a PIN number, while in Australia, it is commonly known as a secret code. Other similar terms include access code, passcode, security code, and verification code. Regardless of the term used, it is imperative to keep the code confidential and secure to ensure the safety of your financial transactions.