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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.
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
Image for XWhen I write X, I mean this:
X is also used in math to indicate a "Variable."
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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