The Bengali letter ক is derived from the Siddhaṃ, and is marked by a similar horizontal head line, but less geometric shape, than its Devanagari counterpart, क. The inherent vowel of Bengali consonant letters is /ɔ/, so the bare letter ক will sometimes be transliterated as "kô" instead of "ka". Adding okar, the "o" vowel mark, কো, gives a reading of /ko/.
Like all Indic consonants, ক can be modified by marks to indicate another (or no) vowel than its inherent "a".
ক is used as a basic consonant character in all of the major Bengali script orthographies, including Bengali and Assamese. It is also used with a nukta, ক়, for foreign borrowings of /q/.
Bengali ক exhibits conjunct ligatures, as is common in Indic scripts, with a tendency towards stacked ligatures.[1]