ทูลกระหม่อม

Etymology
From 🇰🇲.

Noun

 * 1) a term of address to a child of a monarch and his or her consort.
 * 2)  a term of address to any child of a monarch.
 * 3) a term used by a royal person to address his or her relative who is a child of a monarch and his or her consort.

Usage notes

 * Colloquially contracted as.
 * Sometimes used as title, as is the case of Princess, a daughter of King and Queen.