The term 'insertion mark' can be defined as a symbol used to indicate where text should be inserted in a document. The most common insertion mark is the caret (^), which is a five-letter word. The caret is often used in computer programming and other coding languages to indicate where a specific command should be placed. It is also used in word processing programs to indicate where text should be inserted. In addition, the caret is sometimes used in mathematics to indicate an exponent or power.