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Word
,→Common Names for Various Word Sizes
A nibble (or nybble) is a half-byte, corresponding to one hexadecimal or BCD digit.
=== Half word, Single word, Double word, Quad word ===
The terms half word (or halfword or half-word), single word, double word, and quad word are often used in contemporary computing to refer to common word sizes relative to 32-bit computing:
* half word = 16 bits
* single word = 32 bits
* double word = 64 bits
* quad word = 128 bits
This terminology can be seen, for example, in the lane naming conventions for AArch64 SIMD (where <code>v0.8h</code> refers to the 128-bit vector register 0 divided in eight half word lanes) and x86_86 instruction suffixes (MOVQ to move a quad word).
