Steve,
What you're referring to are macrons.
In Word, perhaps the simplest method for upper-case macrons is to type the character requiring the macron (eg X), then type 0305, so you end up with X0305, then select the 0305 and press Alt-X, with that you should get X̅. For lower-case characters (eg i), you can use 0304, and get ī. For double bars over a character, you can use 033F, and get x̿ or X̿ (note that the gap between the double lines may be indistinct over some letters).
__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]
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