It is built based on Old Sundanese script (Aksara Sunda Kuno) which was used from the 14th to the 18th centuries.

[3] The standardized script has 32 basic characters-- seven vowels, 23 consonants, and thirteen phonetic diacriticals (Sundanese: rarangkén).

The original eighteen consonants are ka-ga-nga, ca-ja-nya, ta-da-na, pa-ba-ma, ya-ra-la, wa-sa-ha.

An additional five consonants,fa-va-qa-xa-za have been added in order to improve the script as a tool for recording the development of the Sundanese language, especially regarding the adoption of foreign words and sounds.

A basic consonant-vowel syllable is formed by adding a vowel diacritic to a consonant.

Sakumna jalma gubrag ka alam dunya téh sipatna merdika jeung boga martabat katut hak-hak anu sarua.

Sundanese script was added to the Unicode Standard in April 2008 with the release of version 5.1.