AT SIGN' (4 letters) The term 'Common Keyboard Symbol' can be broken down into two solutions: 'ARROW' (5 letters) and 'AT SIGN' (4 letters). The ARROW is a symbol that is used to indicate direction, movement, or pointing. It is often used in computer programs to indicate the direction of a command or to move an object. The AT SIGN, also known as the 'AT symbol' or 'commercial AT, ' is used in email addresses and other online communication to indicate the recipient of a message. It is also used in programming languages to denote a specific type of variable.