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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"toyu" wrote in message
...
How do you draw a line above word (the opposite of underscore), typically
encountered in electronics where the inverse of a singal is denoted by a
line
above the signal name?