Phra kiao (Thai:พระเกี้ยว[pʰráʔkîaw]), theThai equivalent of thecoronet, is a headgear traditionally worn by young princes and princesses.King Chulalongkorn adopted it as his personal emblem, as it coincided with the literal translation of his name.

When King Chulalongkorn founded theRoyal Pages School, he granted permission for the Phra Kiao to be used as the school'scap badge and symbol. The school later becameChulalongkorn University, which has since inherited and retained the symbol's use.^[1]

The symbol is also used by several schools historically associated with King Chulalongkorn and the university, most notablyTriam Udom Suksa School.