Bengali–Assamese script

There are three major modern alphabets in this script: Tirhuta, Bengali, and Assamese. Modern Assamese is very similar to modern Bengali though Tirhuta is more different from both Assamese and Bengali. Assamese has at least one extra letter, ৱ, that Bengali does not, and the letter ক্ষ is not a conjunct as in Bengali, but a letter by itself. The alphabetical orders of the two alphabets also differ. Languages like Meitei and Bishnupriya Manipuri use a hybrid of the two alphabets, with the Bengali র and the Assamese ৱ. Tirhuta carries forward some forms used in medieval Assamese.

Some other languages use a vowel অৗ to denote /ɯ/ which is not found in either Bengali or Assamese; and though the vowel diacritic (matra, ৗ), is found in Tirhuta the vowel letter itself is absent.

• Assamese Vowels
• Bengali Vowels
• Maithili Vowels

The script presently has a total of 11 vowel letters, used to represent the seven vowel sounds of Bengali and eight vowel sounds of Assamese, along with a number of vowel diphthongs. All of these vowel letters are used in both Assamese and Bengali. Some of the vowel letters have different sounds depending on the word, and a number of vowel distinctions preserved in the writing system are not pronounced as such in modern spoken Bengali or Assamese. For example, the script has two symbols for the vowel sound [i] and two symbols for the vowel sound [u]. This redundancy stems from the time when this script was used to write Sanskrit, a language that had a short [i] and a long [iː], and a short [u] and a long [uː]. These letters are preserved in the script with their traditional names of "short i" and "long i", etc., despite the fact that they are no longer pronounced differently in ordinary speech.

Two additional modified Vowels, অ' and অ্যা, are not considered letters of the Eastern Nagari script, but are often used in Assamese and Bengali (respectively) to represent certain vowels when the intended pronunciation would otherwise be ambiguous.

Vowel signs can be used in conjunction with consonants to modify the pronunciation of the consonant (here exemplified by ক, kô). When no vowel Diacritic symbol is written, then the vowel "অ" (ô) is the default inherited vowel for the consonant. To specifically denote the absence of a vowel, a hôsôntô (্) may be written underneath the consonant.

The names of the consonant letters in Eastern Nagari are typically just the consonant's main pronunciation plus the inherent vowel "অ" ô. Since the inherent vowel is assumed and not written, most letters' names look identical to the letter itself (e.g. the name of the letter "ঘ" is itself ঘ ghô, not gh). Some letters that have lost their distinctive pronunciation in Modern Assamese and Bengali are called by a more elaborate name. For example, since the consonant phoneme /n/ can be written ন, ণ, or ঞ (depending on the spelling of the particular word), these letters are not simply called nô; instead, they are called "dental nô", "cerebral nô" and niô. Similarly, the phoneme /ʃ/ in Bengali and /x/ in Assamese can be written as "palatal shô/xhô" শ , "cerebral shô/xhô" ষ, or "dental sô/xô" স, depending on the word.