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Nibble

This article is about the data storage unit. For other uses, see Nibble (disambiguation).

An octet code page 866 font table ordered by nibbles.

In computing, a nibble[1], or spelled nybble to match byte, is a unit of information that is an aggregation of four-bits; half of a byte/octet[1][2][3]. The unit is alternatively called nyble, nybl, half-byte[4] or tetrade.[5][6] In networking or telecommunications, the unit is often called a semi-octet,[7] quadbit,[8] or quartet.[9][10]

As a nibble can represent sixteen (24) possible values, a nibble value is often shown as a hexadecimal digit (hex digit).[11]. A byte is two nibbles, and therefore, a value can be shown as two hex digits.

Four-bit computers use nibble-sized data for storage and operations; as the word unit. Such computers were used in early microprocessors, pocket calculators and pocket computers. They continue to be used in some microcontrollers. In this context, 4-bit groups were sometimes also called characters[12] rather than nibbles.[1]

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