The term 'INVERTED 'V' mark' is often referred to as a caret, which is a five-letter word. A caret is a symbol (^) used in writing and proofreading to indicate that something should be inserted at that point in the text. It is also used in mathematics to indicate an exponent, such as in x^2. The caret is often used in computer programming languages to indicate the beginning of a comment. In some fonts, the caret is also used to represent the logical operator 'not'.