The crossword solution for the term WHAT '/' INDICATES is SPARE. This term is used in a variety of contexts, but it is most commonly used to indicate an extra or unused item. For example, a SPARE tire is an extra tire that is kept in case of an emergency. It can also be used to describe a person who is not actively involved in a particular activity, such as a SPARE player in a game of basketball. In computing, it is often used to refer to a backup copy of a file or program.