Three-bar cross

The Patriarchal cross (☨) is a variant of the Christian cross, the religious symbol of Christianity. Similar to the familiar Latin cross, the Patriarchal cross possesses a smaller crossbar placed above the main one, so that both crossbars are near the top. Sometimes the patriarchal cross has a short, slanted crosspiece near its foot (Orthodox cross). This slanted, lower crosspiece often appears in Byzantine Greek and Eastern European iconography, as well as in Eastern Orthodox churches.

The Byzantine Christianization came to the Morava empire in the year 863, provided at the request of Rastislav sent Byzantine Emperor Michael III. The symbol, often referred to as the patriarchal cross, appeared in the Byzantine Empire in large numbers in the 10th century. For a long time, it was thought to have been given to Saint Stephen by the pope as the symbol of the apostolic Kingdom of Hungary.

The two-barred cross is one of the main elements in the coats of arms of Hungary since 1190. It appeared during the reign of King Béla III, who was raised in the Byzantine court. Béla was the son of Russian princess Eufrosina Mstislavovna. The cross appears floating in the coat of arms and on the coins from this era. In medieval Kingdom of Hungary was extended Byzantine Cyril-Methodian and western Latin church was expanded later.

The two-barred cross in the Hungarian coat of arms comes from the same source of Byzantine (Eastern Roman) Empire in the 12th century. Unlike the ordinary Christian cross, the symbolism and meaning of the double cross is not well understood.

...
Wikipedia