Word to describe the Operating System size?

I want to have an enum that describes the "wid开发者_运维知识库th" of the Operating System.

The Values will be OS32 or OS64, but what is a good name for the enum its self?

enum OS_SIZE
{
   OS32,
   OS64
}

The best I can come up with is "OS Size", or maybe "OS Word Size" but I don't really like these. Is there a term in the industry that is used to describe the underlying word width of the operating system?

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• Bitness
• PointerSize
• WordLength.

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WMI calls it AddressWidth, for example.

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It's not the size of the OS, but the number of bits of a main memory address: 32 bits vs. 64 bits, which is also the size of a pointer.

Either case, the main difference is from a hardware architecture point of view, so I'd say "Number of Bits in Architecture Address", NoBiAA, or just "ARCH_ADDR_SIZE".

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OSWordSize and OSWordBitSize both work for me.