# Math Symbols fonts like Gigi fonts in Microsoft windows

I want to get the font in mathmode like Gigi in Microsoft windows as follow:

In LaTeX math fonts, I find out that I use \mathscr{S} (mathrsfs package) like the code is

%\usepackage{mathrsfs}

$\mathscr{S} = \sum_i^n a_i$


get the fonts:

It is not very good, My question is that how to get it better by a new command or package, something else and so on?

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The font that comes closest to your example, and has TeX support is probably Adobe Bickham Script Pro, but it is a commercial font, and quite expensive. To look for other alternatives you may consult the documentation of the mathalfa package.