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What is more correct, km2 or sqkm?

I'd prefer to use km with a superscript 2, but it's not always possible to format text that way so I was just wondering if there is a convention that should be used when you can't use superscript formatting.

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up vote 10 down vote accepted

I generally use the character ² or U+00B2. So it is km², without requiring any special formatting.

If you have a MS Windows keyboard, type the sequence: Alt+0178

Other platforms have different ways of typing this character. You can also copy/paste the Unicode character. More info:

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Alt+0178 - that's what I needed, thanks Mike – Ian Apr 30 '12 at 2:34

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