(monumental) inscription at Bolnisi Sioni is one of the oldest extant samples of the Georgian alphabet
. The "Bolnisi cross" appears in the center of the inscription.
The Bolnisi cross (Georgian: ბოლნისის ჯვარი bolnisis ǰvari) is a cross symbol, taken from a 5th-century ornament at the Bolnisi Sioni church, which came to be used as a national symbol of Georgia.
It is a variant of the Cross pattée popular in Christian symolism of late antiquity and the early medieval period. The same symbol gave rise to cross variants used during the Crusades, the Maltese cross of the Knights Hospitaller and (via the Jerusalem cross and the Black cross of the Teutonic Order) the Iron cross used by the German military.
The four small crosses used in the Georgian Flag are officially described as bolnur-kac'xuri (bolnur-katskhuri, ბოლნურ-კაცხური) even though they are only slightly pattée.