Mirror armour, sometimes referred to as disc armour or as chahār-āyneh or char-aina, is a type of cuirass that was used mainly in Asia and Eastern Europe, including India, Iran, Tibet, Russia, and the Ottoman Empire. It literally translates to "four mirrors" which is a reflection of how these pieces look, resembling four metal discs or rectangular armour plates. Mirror armor was used in some cultures up to the 20th century.