Button word is a term used to describe a type of computer security. It is a type of authentication system that requires the user to PRESS a physical button or switch in order to gain access to a computer system. The two most common types of button words are PRESS (5 letters) and REC (3 letters). PRESS stands for Physical Randomized Encryption Security System and REC stands for Randomized Encryption Code. Both systems require the user to PRESS a physical button or switch in order to gain access to the computer system. The button word is designed to provide an extra layer of security by making it difficult for unauthorized users to gain access to the system.