The term 'wedge-shaped mark' can be represented by the 5-letter word 'caret'. A caret is a symbol (^) used in writing and proofreading to indicate where something should be inserted or changed. It is also known as a circumflex, and is often used to denote an exponent in mathematical equations. The caret is wedge-shaped, and is commonly used in text editing software to indicate where the user should type.