The term 'insertion indicator' is often referred to as a caret, which is a symbol (^) used in writing and editing to indicate where additional text should be inserted. It is commonly used in word processing programs to indicate the position of the cursor. The caret is also used in mathematics and other fields to indicate an exponent or superscript. In programming, it is used to denote the logical negation operator. In general, the caret is used to indicate the insertion of text or data into a document or program.