Christogram' is an abbreviation for the name of Jesus Christ.

In Eastern Orthodoxy, it is a four-letter abbreviation ICXC - a traditional abbreviation of the Greek words for "Jesus Christ" (i.e., the first and last letters of each of the words "ΙΗΣOΥΣ ΧΡΙΣΤΟΣ; IHCOYC XRICTOC"). On Western Orthodox icons this christogram may be split: "IC" on the left of the image and "XC" on the right, often with titlos. Some traditions, including Protestants, simplify it to "IHC" or "IHS".

IHS is sometimes mistaken as meaning Iesus Hominum Salvator which means "Jesus, Savior of Man".

"ICXC" may also be seen inscribed into the Ichthys.

In many other Christian denominations a christogram, also called Chi-Rho or Labarum (A Labarum is latin for a standard with a little flag hanging on it, used in the army. A christogram was added to the flag as an image of the Greek letters Chi Rho, in the late Roman period. So christogram and labarum are not synonims.), is a monogram and symbol for Jesus Christ consisting of the superimposed Greek letters Chi and Rho.

The most commonly encountered Christogram is the X (or more accurately Greek letter Chi) in the word "Xmas", which represents the first letter of the word Christ.

See also: Christian symbolism, Labarum.