The Ol Chiki (ᱚᱞ ᱪᱤᱠᱤ) script, also known as Ol Cemetʼ (Santali: ol 'writing', cemet' 'learning'), Ol Ciki, Ol, and sometimes as the Santali alphabet, is the official writing system for Santali, an Austroasiatic-Munda language recognized as an official regional language in India. It has 30 letters, the forms of which are intended to evoke natural shapes. The script is written from left to right.
The shapes of the letters are not arbitrary, but reflect the names for the letters, which are words, usually the names of objects or actions representing conventionalized form in the pictorial shape of the characters.— Norman Zide, 
Previously, Santali had been written with the Latin script. However, Santali is not an Indo-Aryan language and Indic scripts did not have letters for all of Santali's phonemes, especially its stop consonants and vowels, which made writing the language accurately in an unmodified Indic script difficult. The detailed analysis was given by Byomkes Chakrabarti in his "Comparative Study of Santali and Bengali". Missionaries (first of all Paul Olaf Bodding, a Norwegian) brought the Latin script, which is betterat representing Santali stops, phonemes and nasal sounds with the use of diacritical marks and accents. Unlike most Indic scripts, Ol Chiki is not an abugida, with vowels given equal representation with consonants. Additionally, it was designed specifically for the language, but one letter could not be assigned to each phoneme because the sixth vowel in Ol Chiki is still problematic.
The values of the letters are as follows:
|ᱜ||ag||/k’/, /g/||g||k’||ग||গ||ଗ୍||vomiting mouth which produces the same sound as the name of the letter|
|ᱟ||laa||/a/||ā||a||आ||আ||ଆ||working in the field with a spade|
|ᱠ||aak||/k/||k||k||क||ক||କ୍||bird (sound of a swan)|
|ᱡ||aaj||/c’/, /j/||j||c’||ज||জ||ଜ୍||person pointing towards a third person with the right hand (saying he)|
|ᱢ||aam||/m/||m||m||म||ম||ମ୍||person pointing towards a second person with the left hand (saying you)|
|ᱣ||aaw||/w/, /v/||w||w||व||ওয়||ୱ||opening lips|
|ᱦ||ih||/ʔ/, /h/||ẖ||h||ह||হ||ହ୍||hands up|
|ᱧ||iny||/ɲ/||ñ||ñ||ञ||ঞ||ଞ୍||person pointing towards himself/herself with the left hand|
|ᱨ||ir||/r/||r||r||र||র||ର୍||sickle used for cutting or reaping|
|ᱩ||lu||/u/||u||u||उ||উ||ଉ||vessel used for preparing food|
|ᱪ||uch||/c/||c||c||च||চ||ଚ୍||peak of a mountain which is usually high|
|ᱬ||unn||/ɳ/||ṇ||ṇ||ण||ণ||ଣ୍||picture of a flying bee (which makes this sound)|
|ᱭ||uy||/j/||y||y||य||য়||ୟ୍||a man bending towards ground to cut something|
|ᱮ||le||/e/||e||e||ए||এ||ଏ||overflowing rivers changing course|
|ᱯ||ep||/p/||p||p||प||প||ପ୍||person receiving with both hands|
|ᱰ||edd||/ɖ/||ḍ||ḍ||ड||ড||ଡ୍||a man with two legs stretching towards his chest and mouth|
|ᱱ||en||/n/||n||n||न||ন||ନ୍||thrashing grains with two legs|
|ᱲ||err||/ɽ/||ṛ||ṛ||ड़||ড়||ଳ୍||a path that turns to avoid an obstruction or a danger|
|ᱳ||lo||/o/||o||o||ओ||ও||ଓ||a mouth when sounding this letter|
|ᱵ||ob||/p’/, /b/||b||p’||ब||ব||ବ୍||curly hair|
|ᱷ||oh||/ʰ/||h||(C)h||ह||হ||ହ||a man throwing something with one hand|
Ol Chiki employs several marks which are placed after the letter they modify (there are no combining characters):
|ᱹ||găhlă ṭuḍăg||This baseline dot is used to extend three vowel letters for the Santal Parganas dialect of Santali: ᱚᱹ ŏ /ɔ/, ᱟᱹ ă /ə/, and ᱮᱹ ĕ /ɛ/. The phonetic difference between ᱚ and ᱚᱹ is not clearly defined and there may be only a marginal phonemic difference between the two. ᱚᱹ is rarely used. ALA-LC transliterates ᱚᱹ as "ạ̄".|
|ᱸ||mũ ṭuḍăg||This raised dot indicates nasalization of the preceding vowel: ᱚᱸ /ɔ̃/, ᱟᱸ /ã/, ᱤᱸ /ĩ/, ᱩᱸ /ũ/, ᱮᱸ /ẽ/, and ᱳᱸ /õ/. ALA-LC transliteration uses "m̐" after the affected vowel.|
|ᱺ||mũ găhlă ṭuḍăg||This colon-like mark is used to mark a nasalized extended vowel. It is a combination of mũ ṭuḍăg and găhlă ṭuḍăg: ᱚᱺ /ɔ̃/, ᱟᱺ /ə̃/, and ᱮᱺ /ɛ̃/.|
|ᱻ||relā||This tilde-like mark indicates the prolongation of any oral or nasalized vowel. Compare ᱮ /e/ with ᱮᱻ /eː/. It comes after the găhlă ṭuḍăg for extended vowels: ᱮᱹᱻ /ɛː/. It is omitted in ALA-LC transliteration.|
|ᱽ||ahad||This special letter indicates the deglottalization of a consonant in the word-final position. It preserves the morphophonemic relationship between the glottalized (ejective) and voiced equivalents of consonants. For example, ᱜ represents a voiced /g/ when word initial but an ejective /k’/ when in the word-final position. A voiced /g/ in the word-final position is written as ᱜᱽ. The ahad is used with ᱜ, ᱡ, ᱦ, ᱫ, and ᱵ which can form cursive ligatures with ᱽ in handwriting (but not usually in printed text). ALA-LC transliteration uses an apostrophe (’) to represent an ahad.|
|ᱼ||phārkā||This hyphen-like mark serves as a glottal protector (the opposite function as the ahad.) It preserves the ejective sound, even in the word-initial position. Compare ᱜᱚ /gɔ/ with ᱜᱼᱚ /k’ɔ/. The phārkā is only used with ᱜ, ᱡ, ᱫ, and ᱵ. It is omitted in ALA-LC transliteration.|
Ol Chiki has its own set of digits:
Some Western-style punctuation marks are used with Ol Chiki: comma (,), exclamation mark (!), question mark (?), and quotation marks (“ and ”).
- ᱾ (mucăd) marks a minor break
- ᱿ (double mucăd) marks a major break
Ol Chiki script was added to the Unicode Standard in April, 2008 with the release of version 5.1.
The Unicode block for Ol Chiki is U+1C50–U+1C7F:
Official Unicode Consortium code chart (PDF)
- "Ol Chiki Script". A portal for Santals. 2002. Retrieved 2017-09-12.
- Hembram, Phatik Chandra (2002). Santhali, a Natural Language. U. Hembram. p. 165.
- Kundu, Manmatha (1994). Tribal Education, New Perspectives. Gyan Publishing House. p. 37. ISBN 9788121204477.
- Bodding, P. O (1922). Materials for a Santali grammar. Santal Mission of the Northern Churches. Retrieved 15 February 2019.
- Zide, Norman (1996). Daniels, Peter T.; Bright, William (eds.). The World's Writing Systems. Oxford University Press, Inc. pp. 614–615. ISBN 978-0195079937.
- "Santali (in Ol script)" (PDF). ALA-LC Romanization Tables. Library of Congress. Retrieved 2017-09-12.
- Everson, Michael (2005-09-05). "L2/05-243R: Final proposal to encode the Ol Chiki script in the UCS" (PDF).
- "The Unicode Standard, Chapter 13.10: Ol Chiki" (PDF). Unicode Consortium. March 2019.