The Ol Onal, also known as also known as Bhumij Lipi or Bhumij Onal, is an alphabet writing system for the Bhumij language. Ol Onal script was created between 1981 and 1992 by Ol Guru Mahendra Nath Sardar. Ol Onal script is used to write the Bhumij language in some parts of West Bengal, Jharkhand, Orissa, and Assam.
The Ol Onal script was created in between 1981 and 1992 by Mahendra Nath Sardar for writing Bhumij in India. It was initially designed by Sardar as a bicameral script, where the lowercase letters were known as Galang Onal, however only the capital letters called Ol Onal have been used for teaching and printed books. Sardar wrote many text books in the script (using only Ol Onal capital letters), but there's no known record of Sardar's Galang Onal lowercase letters (which are very different from the taught capitals) ever being used in publications, except in the script author's personal design manuscripts, with various tried variants that Sardar did not promote for wide use in the Bhumij community.
There are three additional signs (referred to as ṭiḍaḥ): the nasalisation sign mu (or mun arang ˜, a dot diacritic used above vowel letters), the lengthening sign ikir (or ikir arang ː, a dot diacritic used only below the vowel letter a ɔ, where it can occur simultaneously with the nasalisation sign mu), and hoddond (a special sign occurring only after the consonant letters ab b and uj ʤ to indicate glottalisation ɒ).
The script also includes ten decimal digits, and an additional abbreviation sign (a small ring above the baseline, at the middle height of letters and digits).
The Unicode block for Ol Onal is U+1E5D0–U+1E5FF:
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