A nibble (sometimes spelled nybble) is also 4 bits, this is, half a byte. Being four bits, there are sixteen ( 24 ) possible values. A nibble is evenly representable by a hexadecimal number. A full byte is evenly representable by two hexadecimal numbers; therefore it is a common way to display bytes of information as two hexadecimal nibbles. (Compare this definition of nibble with the one above; computer scientists have a tradition of giving things "punny" names.)
There is also the "Nibbles game[?]"--very fun, very old and very famous; today present in many cell phones.
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