What Does X Mean in a Text?

X means "Kiss" and can also mean "Variable" (in Math).


The 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 among friends, that not including one may be considered a snub or an indication that the sender is annoyed.

Here is a table showing the possible meanings of Xs at the end of a message:
Number of XsMeaning
No X(1) If the sender normally sends an X, then the sender may be annoyed.
(2) If the message is business-like and not among friends, then no X is appropriate.
(3) If messaging is back and forth, then Xs are often dropped until the last message.
One X (1) A light kiss.
(2) If a kiss seems inappropriate, then the X probably just signifies a friendly tone. This unclear distinction does allow a single X to be used for flirting, as it provides the sender with plausible deniability. ("I was just being friendly.")
Two Xs With XX, the sender's intent was to send kisses.
Three or more Xs If you've been sent three or more Xs, they are definitely affectionate kisses. (See also XXXX.)


The 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).

A "variable" doesn't have to be indicated by the letter X. It could be any other letter, word or symbol.

Image for X

When I write X, I mean this:

meaning of X

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.
Guessability:guessability level 1
1: Easy to guess
Typical Users:typical user

Adults, Teenagers, and Under 13s

Second Definition for X

"Variable" is common definition for X in math.
Guessability:guessability level 1
1: Easy to guess
Typical Users:typical user

Adults and Teenagers

Examples of X in Sentences

Here are examples of X being used in conversations:
  • Lou: Okay. See you there.
  • Jo: Don't be late! X
  • (Here, X means "Kiss.")
  • Sam: If X plus me equals 100%, what's the value of X?
  • Ali: Me?
  • Sam: Correct! X
  • (Here, X means both "Kiss" and "Variable.")

An Academic Look at X

In 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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This page is maintained by the Cyber Definitions Editorial Team.

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