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What Does X Mean?X means "Kiss" and can also mean "Variable" (in Math).
KissThe letter X is widely used at the end of text messages and emails to signify a "Kiss." It can be typed in either uppercase (X) or lowercase (x) without significantly altering its meaning. However, uppercase may sometimes be used to provide emphasis (i.e., to signify a big kiss).
The use of a single X at the end of a message should not always be regarded as a sign of particular affection. It is often included just to add a warm tone to a message, or simply out of habit. In fact, the inclusion of a single X at the end of a message is so common amongst friends, that not including one may be considered a snub or an indication that the sender is annoyed. (For a table showing the possible meanings of Xs at the end of a message, check out our page on XX (Kisses).)
VariableThe letter X is often used in math to mean a value that is not yet known. It is called a "Variable." For example, in X - 3 = 9, X is the "Variable" (which, in this case, equals 12).
Of note: A "Variable" doesn't have to be indicated by the letter X. It could be any other letter, word or symbol.
Image for XWhen I write X, I mean this: X is also used in math to indicate a "Variable."
Summary of Key Points
First Definition for X"Kiss" is the most common definition for X on Snapchat, WhatsApp, Facebook, Twitter, Instagram, and TikTok.
1: Easy to guess
Adults, Teenagers, and Under 13s
Second Definition for X"Variable" is common definition for X in math.
1: Easy to guess
Adults and Teenagers
Examples of X in SentencesHere are examples of X being used in conversations:
- Gill: Okay. See you there.
- Jo: Don't be late! X (Here, X means "Kiss.")
- Gail: If X plus me equals 100%, what's the value of X?
- Jon: Me?
- Gail: Correct! XXX (Here, X means both "Kiss" and "Variable.")
An Academic Look at XIn the Middle Ages, most people were illiterate and could only write the letter X. As a result, many people signed letters and sealed envelopes with an X, which they then kissed as a sign of faith and honesty. It is generally accepted that this X represented the Christian cross. However, it is also thought that the X may have represented the name of Jesus Christ, deriving from "ΧΡΙΣΤΟΣ" (which is the Greek word for Christ).
If the X represents a cross, it would be classified as a symbol, rather than a letter. However, if it represents the name of Jesus Christ, it would be a letter. In which case it would be an initialism abbreviation.
What Did We Say before Texting and Social Media?The use of the letter X to represent a kiss long pre-dates the digital era.
Example of X Used in a Text
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