Nybble
A nybble (sometimes spelled nibble) is a set of four bits. Since a full byte is eight bits, a nybble is half a byte. It is sometimes called a half-byte or tetrade; in the context of computer networking, it is also called a semi-octet, quadbit, or quartet. The four bits in a nybble provide a set of 16 possible values.
A single nybble can be represented by one of the 16 hexadecimal digits (0-F); when shown this way, a nybble is called a hex digit. A full byte can be portrayed by a pair of hex digits (00-FF).
The table below lists all 16 possible nybbles, along with the corresponding hex digit.
| Binary Value | Hex Digit | Binary Value | Hex Digit |
|---|---|---|---|
| 0000 | 0 | 1000 | 8 |
| 0001 | 1 | 1001 | 9 |
| 0010 | 2 | 1010 | A |
| 0011 | 3 | 1011 | B |
| 0100 | 4 | 1100 | C |
| 0101 | 5 | 1101 | D |
| 0110 | 6 | 1110 | E |
| 0111 | 7 | 1111 | F |