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Endianness or byte order is the order of bytes in a multi-byte value like a word. Systems are usually referred to as either 'little endian', where the most significant byte (msb) comes first, or 'big endian', where the least significant byte (lsb) comes first.

More non-ROM hacking specific information can be found at Wikipedia's Endianness article.

Little endian systems

Big endian systems