Here are two ways
(Word 2003) keyboard shortcut--Select the number to superscript:
Ctrl+Shift+=

You could also add the Superscript button to a Toolbar. Tools | Customize.
Click on the Commands Tab and look in the Format Category. Find Superscript
and drag it onto a toolbar.

tj

"Mike1103" wrote:

I want to state certain facts in both square metres and cubic metres. I type
3m3 and 5m2 but I want the last 3 and 2 respectively show up in document the
same way as footnote numbers do.