Bit

1. An abbreviation of binary digit, the smallest unit of binary data.
2. A single character of a language employing only two distinct kinds of characters.
3. A quantity of intelligence which is carried by an identifiable entity and which can exist in either of two states.
4. A unit of storage capacity; the capacity in bits of a storage device is the logarithm to the base two of the number of possible states of the device.
5. A quantum of information.
6. Loosely, a mark.

See also: Baud Rate, Bitrate, bits per second, Bitstream, Byte, Least Significant Bit (LSB), Most Significant Bit (MSB), Nibble, Resolution, Word, Wyde.