Editing Thai script (section)

==== Sibilants ====
''Inserted sounds'' (เสียดแทรก ''siat saek'') follow the semi-vowel ว in alphabetical order.
{| class="wikitable"
|-
! Series
! Thai
! Devanagari
|-
| palatal 
| {{Letter|ch=ศ|s=Thai|iso=sà}}
| {{Letter|ch=श|s=Deva|ipa=/ɕ/|iso=śa}}
|-
| retroflex 
| {{Letter|ch=ษ|s=Thai|iso=sà}}
| {{Letter|ch=ष|s=Deva|ipa=/ʂ/|iso=ṣa}}
|-
| dental 
| {{Letter|ch=ส|s=Thai|iso=sà}}
| {{Letter|ch=स|s=Deva|ipa=/s/|iso=sa}}
|}

Like Sanskrit, Thai has no voiced sibilant (so no 'z' or 'zh'). In modern Thai, the distinction between the three high-class consonants has been lost and all three are pronounced 'sà'; however, foreign words with a sh-sound may still be transcribed as if the Sanskrit values still hold (e.g., ''ang-grit'' อังกฤษ for ''English'' instead of อังกฤส).
:'''ศ ศาลา''' (so sala) leads words, as in its example word, ศาลา. The digraph ศรี (Indic ''[[sri]]'') is regularly pronounced สี (si), as in [[Sisaket Province]], Thai: ศรีสะเกษ.
:'''ษ ฤๅษี''' (so rue-si) may only lead syllables ''within'' a word, as in its example, ฤๅษี, or to end a syllable as in ศรีสะเกษ ''Sisaket'' and อังกฤษ ''Angkrit'' English.
:'''ส เสือ''' (so suea) spells native Thai words that require a high-class /s/, as well as [[naturalized]] Pali/Sanskrit words, such as สารท (สาท) in [[Thetsagan Sart|Thetsakan Sat]]: เทศกาลสารท (เทด-สะ-กาน-สาท), formerly ศารท (สาท).
:'''ซ โซ่''' (so so), which follows the similar-appearing ช in Thai alphabetical order, spells words requiring a low-class /s/, as does ทร + vowel.
:'''ทร''', as in the heading of this section, เสียด'''แทร'''ก  (pronounced เสียดแซก ''siat saek''), when accompanied by a vowel (implicit in '''ทรง''' (ซง ''song'' an element in forming words used with royalty); a semivowel in '''ทรวง''' (ซวง ''suang'' chest, heart); or explicit in '''ทราย''' (ซาย ''sai'' sand). Exceptions to ทร + vowel = /s/ are the prefix '''โทร-''' (equivalent to ''tele-'' far, pronounced โทระ ''to-ra''), and phonetic re-spellings of English tr- (as in the phonetic respelling of ''trumpet'': ทรัมเพ็ท.) '''ทร''' is otherwise pronounced as two syllables ทอระ-, as in ทรมาน (ทอระมาน ''to-ra-man'' to torment).