The Bengali script (also known as Bangla) is used for the Bengali language, which belongs to the Indo-Aryan group and is the national language of Bangladesh; it is also spoken by the majority of the population of the Indian State of West Bengal. The Bengali script is also used for Assamese, the Indo-Aryan language of the Indian State of Assam. You can see some Unicode Bengali on the What is Unicode? in Bangla page.
Support for Bengali Unicode in Windows was introduced in 2004 with Windows XP SP2. A free Unicode Bengali keyboard driver for use with Windows 2000 and Windows XP is available from Avro Keyboard - UNICODE Compliant Free Bangla Typing Software. A free Unicode Bengali phonetic keyboard driver for use with Windows 2000 and Windows XP is available from Ekusheyr Shadhinota "Bangla Unicode" Layout - Ekushey. A free keyboard manager for Windows 2000 and Windows XP that allows Unicode input using several layouts is available from Freeware Bengali Unicode Interface.
The characters that appear in the first column of the following table depend on the browser that you are using, the fonts installed on your computer, and the browser options you have chosen that determine the fonts used to display particular character sets, encodings or languages.
You can find some or all of the characters in this range in the Windows Unicode fonts Akaash, ALPHABETUM Unicode, Arial Unicode MS, Bangla, BN BIDISHA Opentype, Chrysanthi Unicode, CN-Arial, Code2000, Ekushey Azad, Ekushey Durga, Ekushey Puja, Ekushey Punarbhaba, Ekushey Saraswatii, Ekushey Sharifa, Ekushey Sumit, Free Idg Serif, Free Serif, Likhan, Mitra Mono, Mukti, Mukti Narrow, Roman Unicode, Raga, Rupali, Saraswati5, SolaimanLipi, Sun-ExtA, UniBangla and Vrinda.
If you are not familiar with the characters, you can check the characters displayed here with the graphical display at http://www.unicode.org/charts/PDF/U0980.pdf.