Type of writing system: syllabic alphabet consisting of 44 basic consonants, each with an inherent vowel: [o] in medial position and [a] in final position. The [a] is usually found in words of Sanskrit, Pali or Khmer origin while the [o] is found native Thai words. The 18 other vowels and 6 diphthongs are indicated using diacritics which appear in front of, above, below of after the consonants they modify.