See http://sbarnhill.mvps.org/WordFAQs/Overbar.htm

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Suzanne S. Barnhill
Microsoft MVP (Word)
Words into Type
Fairhope, Alabama USA
Word MVP FAQ site: http://word.mvps.org
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"WW" wrote in message
...
I need to type some medical abbreviations, like s, a, c, etc. with a
single
line across the top of them. Using Office 2003.