Consonants are divided into three classes: low, mid and high which help to determine the tone of a syllable.
The sounds represented by some consonants change when they are used at the end of a syllable (indicated by the letters on the right of the slash).
Some consonants can only be used at the beginning of a syllable.
Duplicate consonants represent different Sanskrit and Pali consonants sounds which are pronounced identically in Thai.
The letter o ang acts as a silent vowel carrier at the beginning of words that start with a vowel.
The names of the consonants are acrophonic and intended to help with learning them.