To prevent further use of a printing plate after an edition has been printed, the artist sometimes "cancels" the plate by X-ing it out or in some other way defacing it. Sometimes cancellation proofs are made. However, many artists who make woodblock or other relief prints save individual blocks and combine them in different designs.

To prevent further use of a metal plate or stone after an edition has been printed, the artist often "cancels" the stone or plate by X-ing it out or in some other way defacing it. Sometimes cancellation proofs are then pulled to show that the edition has been completed and cancelled.

To delete one of your articles from the newsserver: the newsreader generates a special control message to tell the server to delete this article.

In multiplication of fractions, dividing the same number into both a numerator and a denominator.