What is the noun for "insert"?

Noun for insert is insert itself as noun meaning something that is inserted, as well as insertion which is act of inserting, and inserter for person or device that inserts. Insert as noun pronounced IN-sert, meaning object placed inside something else, such as fireplace insert which is heating unit inserted into existing fireplace opening, magazine insert which is extra pages inserted into magazine, or shoe insert which is insole. So insert is both verb in-SERT meaning to put in, and noun IN-sert meaning thing inserted. Other noun forms include insertion which is act or process of inserting, such as insertion of key, and inserter for machine that inserts. In medical, insert is noun for package insert with drug information. So noun for insert is insert itself as object inserted, and insertion as act, with insert used as noun in contexts like fireplace insert, shoe insert, and magazine insert.