Naturally, a word may be further broken down into four nibbles. Nibble zero is the low order nibble in the word and nibble three is the high order nibble of the word. A double word is exactly what its name implies, two words. Therefore, a double word quantity is 32 bits. Naturally, this double word can be divided into a high order word and a low order word, four bytes, or eight nibbles.
Double words can represent all kinds of different data.
Etymology of Units Data Powers of Ten - These examples illustrate various data media according to how much data they can hold, from a single bit to a yottabyte.