Nibble, Cuado o Cuarteto es el conjunto de cuatro dígitos binarios (bits) o medio octeto. Su interés se debe a que cada cifra en hexadecimal (0, 1, 2,..., 9, A, B, C, D, E, F) se puede representar con un cuarteto, puesto que 24=16. También el cuarteto es la base del sistema de codificación BCD.

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In computing, a nibble (often nybble or nyble to match the vowels of byte) is a four-bit aggregation, or half an octet. It is also known as half-byte or tetrade.In a networking or telecommunication context, the nibble is often called a semi-octet, quadbit, or quartet.A nibble has sixteen (24) possible values. A nibble can be represented by a single hexadecimal digit and called a hex digit. A full byte (octet) is represented by two hexadecimal digits; therefore, it is common to display a byte of information as two nibbles. Sometimes the set of all 256 byte values is represented as a 16×16 table, which gives easily readable hexadecimal codes for each value. Four-bit computer architectures use groups of four bits as their fundamental unit. Such architectures were used in early microprocessors and pocket calculators and continue to be used in some microcontrollers.

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