What's the reasoning behind abbreviating hugs and kisses as X's and O's? Some say X is for hugs and O is for kisses, and some say the other way around; but why X and O, and why are they doubled?

  • 1
    I've always heard it as the other way around, and Wikipedia's article is contradictory on that point: en.wikipedia.org/wiki/Hugs_and_kisses
    – jhocking
    Apr 11, 2011 at 11:12
  • In my experience 'X' for kiss is universal. I've never encountered 'O' for hug.
    – Colin Fine
    Apr 11, 2011 at 11:24
  • They're not always doubled. People often write "xo", and sometimes "xxxooo" or just "xxx". "xoxo" is just one variation on the theme.
    – Caleb
    Apr 11, 2011 at 11:27
  • @Colin Fine: I've never seen "O" used alone, but "X" yes, you're right. "xoxo" is very spread, though.
    – Alenanno
    Apr 11, 2011 at 22:52
  • 3
    Possible duplicate of What is the origin of "xox"?
    – mattdm
    Nov 27, 2017 at 2:04

2 Answers 2


X is for kisses, and O is for hugs.

Simply, the X symbolizes the lips being in "kissing" position, and the O are the arms "hugging" seen from above.

Imagine watching 2 people hugging each other from above, you'd see 2 half-circles crossing each other, so more or less a "O".

See also this: What is the origin of "xox"?

  • 1
    Good answer. Just wanted to add that it really doesn't matter how many you use. More X's and O's simply mean more hugs and kisses.
    – Loquacity
    Apr 11, 2011 at 11:17
  • Good point, +1. As to why they are doubled, is it for doubling the effect? Apr 11, 2011 at 11:18
  • Yeah you're right, I've always seen it that way too.
    – Alenanno
    Apr 11, 2011 at 11:19
  • @Mehper C. Palavuzlar: Yes, it's how @Loquacity said.
    – Alenanno
    Apr 11, 2011 at 18:40

The earliest mention of X and O together dates back to the 1960s. The practice of writing X goes all the way back to Middle Ages, a time when few people were literate. People (mostly illiterate) in those ages used to sign documents using the letter X, probably because it was simple and had religious connotations (Christian cross). It was associated with 'Christ' long before that (the Wikipedia article on the letter X says that X is sometimes used as an abbreviation for 'Christ', so 'Xmas' means 'Christmas').

So by signing X, you're saying In Christ's name, I assert___. Some sources I checked say that the signee would then kiss the X to demonstrate that what was written in the document was true. This can also be confirmed at the Wikipedia article on 'Hugs and kisses'.

According to another article on Today I found, “X” first started being used as a substitute for “Christ” by religious scholars about a millennia ago, which is actually how we ultimately got Xmas as an alternative name for Christmas.

The use of X to indicate a kiss is attested since 1763. The use of O to mean a hug is believed to have arisen in North America. Etymology Nerd and Mental Floss say that it was popularised by Jewish immigrants in the United States who refused to use the cross. That article goes on to say that 'It could've been formed as a contrast to the x, or adopted because of an aesthetic similarity to what a hug looks like'.

Some other sources such as Today I Found Out also suggest that it got its meaning from resembling the arms encircling someone in a hug. Today I Found goes into great detail on the topic and says that the Jewish immigrants (illiterate) refused to use the Christian cross and used O instead to sign their letters and other documents. An article on Mashable.com adds that the letter X then transformed from a religious one to a common romantic one.

Marcel Danesi, a professor of linguistic anthropology and semiotics at the University of Toronto, in an interview with Mashable says:

"The X has always been a Christian symbol, and it is the first Greek letter in the name of 'Christ,' Danesi says. "As far as I can tell, official letters in the medieval period and even after were literally sealed with the X — sealed with a kiss of faith, I guess."

Danesi also explains that illiterate people used the X to sign documents. It was customary for them to plant a physical kiss on the X.

From Washington Post:

And in a discussion chain on the American Dialect Society, linguist Ben Zimmer, in a search of newspaper archives, found “xoxo” and “xoxoxo” used in personal ads from about 1972.

The reason why hugs and kisses is rendered XOXO and not OXOX is unknown. Maybe it because of the influence of Tic-tac-toe. However, according to ScoopWhoop, it's under debate.

  • "So by signing X, you're saying In Christ's name, I assert___." - Though I wouldn't say that that has never been the case, in my experience an X at the end of a letter has represented a kiss 100% of the time.
    – nnnnnn
    Feb 7, 2021 at 0:35
  • 3
    I understand that X is a kiss and O a hug, it even adds an extra dimension to the game "noughts and crosses" but why isn't "hugs and kisses" rendered as "OXOXOX" and "XOXOXO" referred to as "kisses and hugs"?
    – BoldBen
    Feb 7, 2021 at 0:52
  • @BoldBen: That's a good question, but I didn't find anything else to support my answer. :( Feb 7, 2021 at 3:46
  • @BoldBen: But if X=kisses and O=hugs, why do we describe XOXO as hugs and kisses and not kisses and hugs? The debate is on. [ScoopWhoop] Feb 7, 2021 at 4:11
  • While it is possible that this traditional use of X, and later O, for serious purposes, is related to their more recent, relatively lighthearted use, more of an argument would be needed to convince one that it actually is. It is hard to believe that the people who started the latter use in the 1960s and 1970s gave any thought to the history that is presented here.
    – jsw29
    Feb 7, 2021 at 16:28

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