Thai script

Thai script
Name	Thai script
Type	Abugida
Languages	Thai language, Southern Thai language, Northern Thai language, Lao language (historically)
Time	c. 1283–present
Fam1	Proto-Sinaitic script
Fam2	Phoenician alphabet
Fam3	Aramaic alphabet
Fam4	Brahmi script
Fam5	Tamil-Brahmi
Fam6	Pallava script
Fam7	Khmer script
Creator	King Ramkhamhaeng the Great
Iso15924	Thai
Unicode	U+0E00–U+0E7F

Thai script is the alphasyllabic writing system used to write the Thai language and several other regional languages in Thailand. It was created in 1283 by King Ramkhamhaeng the Great of the Sukhothai Kingdom, drawing significant influence from the older Khmer script. The script is notable for its lack of spaces between words and its complex system for denoting lexical tone.

History and origins

The development of the script is historically attributed to King Ramkhamhaeng the Great, as recorded on the Ram Khamhaeng Stele, which is considered one of the earliest known examples. Its primary graphic and structural model was the Khmer script, which itself evolved from the Pallava script, a descendant of the Brahmi script used in ancient South Asia. This lineage connects it to a broader family of writing systems across Southeast Asia, including those used for Lao and the historical Mon scripts. The creation of a distinct script was a significant political and cultural act for the Sukhothai Kingdom, helping to unify the realm and distinguish its identity from the neighboring Khmer Empire.

Structure and characteristics

The script is an Abugida, where each consonant letter carries an inherent vowel sound, which is then modified by diacritic marks. It is written horizontally from left to right, with no spaces between words, though spaces indicate the end of a clause or sentence. A unique feature is that vowels can be written before, after, above, or below their associated consonant, creating a two-dimensional layout. The script also includes several non-alphabetic symbols for punctuation and repetition, such as the rep-etition mark.

Consonants

There are 44 consonant letters in the modern alphabet, but several represent sounds that have merged in modern Standard Thai, leaving only 21 distinct consonant sounds. The letters are traditionally organized into three classes—high, mid, and low—a classification critical for determining tone rules. This three-way classification originates from the historical voicing distinctions in Old Khmer. Notable letters include the first of the series, *Kho khai*, and the last, *Ho nokhuk*. Consonants can also serve as silent letters at the end of a syllable to indicate a specific vowel quality.

Vowels and diacritics

There are 32 vowel symbols comprising both single characters and compound forms, which combine to represent complex vowel nuclei and diphthongs. These symbols, such as those for *sara a* and *sara ii*, are written as diacritics in various positions relative to the initial consonant. Additional diacritics include the *phinthu*, which silences the inherent vowel, and the *thanthakhat*, which marks a final short vowel. The system also uses specific symbols for Sanskrit and Pali loanwords, like the *phinthu* and *yamakkan*.

Tones and tone marks

Standard Thai has five phonemic tones: mid, low, falling, high, and rising. Tone is determined by a complex interplay of four factors: the consonant class (high, mid, low), the type of syllable (live or dead), the vowel length, and one of four possible tone marks. The tone marks, such as *mai ek* and *mai tho*, are diacritics placed above the consonant. This system, while systematic, presents a significant learning challenge, as the same mark can produce different tones depending on the class of the initial consonant.

Usage and conventions

Beyond Standard Thai, the script is used for several regional languages including Southern Thai, Northern Thai, and religious texts in Pali. It is the official script for all government, education, and media communication in the Kingdom of Thailand. Specialized conventions govern the writing of royal and royal court vocabulary, which employs an archaic and highly respectful lexicon. The script is supported in the Unicode standard within the block U+0E00–U+0E7F, ensuring its use in digital communication.

Category:Writing systems Category:Thai language