Thai, being derived from Indic scripts, also has vowel signs, although they are used in a slightly more complex way.

In the example on this slide, three vowel signs surround the consonant พ to produce the desired effect.

Whereas in the Indic scripts all vowel signs are combining characters, only one of the vowel signs in this example is combining. The other two (indicated by arrows) are normal spacing characters. This is a distinction introduced to Unicode at the request of the Thai national standards body.