Thai Stacking Diactritics

The writing system of Thai is based on Pali, Sanskrit and Indian concepts, and many Mon and Khmer words have entered the language.

To represent a vowel other than the inherent one, extra strokes or marks are added around the basic letter. Thai has its own system of diacritics derived from Indian numerals, which denote different tones. Interestingly, like many non-Roman scripts, it has stacking diacritics.