R00KIE said:It seems to be what FvM says, to me the circle around the uppercase sigma seems just a kind of highlight/distinction from the rest of the text as it isn't used in any of the formulas in the picture.
Also the authors say it defines a summing operation which is usually defined by the uppercase sigma.
R00KIE said:Custom font or inserted it as an image maybe.
I use linux and openoffice so here's how a custom symbol looks like.
I'm sure you can do something similar with the MS office suite.
mostafa ahmed said:you can insert this symbol and from shapes you can use oval and from shap fill made it no fill you will find you want.
I attach you want.
Good luck.
FvM said:How do you know, that it's a symbol from any existing character set? It can be simply a text field with a circular outline.
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