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Inmedieval times, most people were unable to read or write. When it came time to sign a document, people who could not write usually made an "X" mark. Of course,an "X" is not much of a signature.To add a sense of commitment, it became customary to kiss the "X" after writing it.

Kissing the "X" was "performance law," a ritual act that bound thepartiesthe way legal documents bind us today. This act, witnessed by the person who wrote the text, represented asolemn guaranteeof the truthfulness of what was written, and an oath to carry out whatever obligations were stated in the document.

Over the years, the "X" and the kiss becameinterchangeable. Today, people who can read and write might still add one or more "X" marks to their letters, maybe with a couple of "O"sthrown inforhugs.