bitwise AND
Bitwise AND is a bit-level operation on two binary values which indicates which bits are set in both values. For each position , if and only if the bit in both values is 1, then of the result is also 1, othewise, it’s 0. For example, given 50 and 163 in two unsigned bytes, a bitwise AND returns 34.
In most high-level programming languages that offer bitwise AND, the usual operator is a single ampersand (&), not to be confused with a double ampersand (&&) which performs a Boolean AND, returning a True or False value.
The Windows Calculator offers bitwise AND in scientific calculator mode, while the Mac OS X Calculator offers it in programmer mode.