Kisses XXX SYMBOL at the end of a letter – In medieval times, when most people were illiterate, “contracts were not considered legal until each signer included St. Andrew’s cross after their name.” (Or instead of a signature, if the signer couldn’t write.)
To prove their sincerity, signers were then required to kiss the X. “Throughout the centuries this custom faded out, but the letter X [became associated] with a kiss.” This is also probably where the phrase “sealed with a kiss” comes from.
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