Bengali–Assamese script
Vowel signs can be used in conjunction with consonants to modify the consonant's pronunciation (e.g. , kô). When there isn't a vowel diacritic symbol, the vowel "" (ô) is the default vowel for the consonant. For example, under this rule, the letter চ is pronounced cho. To note the absence of a vowel, a hôsôntô (্) may be written underneath the consonant, e.g. দ্ d.