Khachkar is the primary signifier of the Armenian art. These cross-stones cannot be found almost anywhere else outside the country, while in Armenia there are over 40,000 of them. Only in Noratus, which has the largest cemetery with khachkars, encountered are about a thousand of steles. There are amazingly beautiful stones with incredibly complex lace ornament among them. One of the Noratus khachkars is kept in the British Museum. It was donated to the museum by Catholicos Vazgen. Typically, khachkars served as gravestones and were erected in intercession for beloved people to patronize them at the Last Judgment – the way they were used in Noratus. The tradition of installing a cross-stone on the grave is still preserved in Armenia, but it has obtained other purposes; today the steles are erected in commemoration of important historical events or as an architectural decoration. The oldest known khachkar dates back to the year of 879 AD. Early khachkars are of various shapes: oval, square, rectangular. However, over time, strict rules were defined: an image of a cross with a carved solar disk on a rectangular stele under it. In 2010, the symbolism and craftsmanship of Khachkars were inscribed on the UNESCO Representative List of the Intangible Cultural Heritage of Humanity.