The Armenian religious art form of stone crosses.

"Khachkar" is composed of two words:
khach: cross
kar: stone
(sort of obvious, no?)

A stone cross is usually a vertical rectangle with an intricately engraved cross. Often the cross in relief is surrounded by enscription.

The first stone crosses in Armenia date back to between 4th and 7th centuries. The modern form of the artwork was formalized in the 9th century. They are often found in graveyards and churches (the usual places).