The term 'ADDITION SYMBOL' can be solved by two different crossword solutions: CARET (5 letters) and PLUS (4 letters). The caret symbol (^) is a V-shaped mark used in mathematics to indicate an exponent, or the operation of raising a quantity to a power. It is also used in computer programming to indicate the logical operator XOR. The PLUS sign ( ) is a mathematical symbol used to indicate addition or positive values. It is also used in many other contexts, such as to indicate the presence of a particular feature or to denote a choice between two options.