[Libreoffice] Word doesn't see symbols

[Deve]

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I create math symbols on writer. It doesn't have font "Symbol". Only 
"OpenSymbol". Next I send document to somebody, who have only MS Word. 
He doesn't have "OpenSymbol". Word doesn't display some symbols. For 
example CDOT on math equation.

It's a problem when I must work with somebody who has only Word.

It could be solved if I could change font to official "Symbol". But I 
don't see it on properties.

Maybe better compatibility on saving to doc...

Any suggestions?