Block from U+0980 to U+09FF. This block was introduced in Unicode version 1.1 (1993). It contains 93 codepoints.
The Wikipedia provides the following information on block Bengali:
Bengali is a Unicode block containing characters for the Bengali, Assamese, Bishnupriya Manipuri, Daphla, Garo, Hallam, Khasi, Mizo, Munda, Naga, Rian, and Santali languages. In its original incarnation, the code points U+0981..U+09CD were a direct copy of the Bengali characters A1-ED from the 1988 ISCII standard, as well as several Assamese ISCII characters in the U+09F0 column. The Devanagari, Gurmukhi, Gujarati, Oriya, Tamil, Telugu, Kannada, and Malayalam blocks were similarly all based on ISCII encodings.