Represents a big endian type. Most significant bits come first, so 0x4000 is, for example, represented as [04, 00].
Represents a little endian type. Most significant bits come last, so 0x4000 is, for example, represented as [00, 04].
Represents a little endian type in packed binary-coded decimal coding. This coding is common in old processors, but doesn't see much use in the modern era.