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 became interchangeable. Today, people who can read and write might still add one or more "X" marks to their letters, maybe with a couple of "O"s thrown in for hugs.
The Oxford English Dictionary states that X is "used to represent a kiss, esp. in the subscription to a letter.". There is no general consensus on the origins of the O as a hug. The O could relate to the shape formed when two hands are crossed in a hug, forming a type of O. The 'X' may also refer to the pursing of the lips when kissing.
牛津英语字典叙述 X 为“用于表达吻，尤其在书信的署名处”。但对于作为拥抱含义的 O 的起源并没有普遍共识。字母 O 可能与拥抱时两手交叠而成 O 的形状有关系。字母 X 可能也与接吻时噘起嘴唇而成的形状有关。
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