The enhanced text string you show "{/Symbol-Italic xxx}" requests a font named Symbol-Italic. If you have such a font available, it will work. If you have no such font, it won't work. Gnuplot does not provide its own fonts; it just passes the font name on to whatever output device you have selected.
The most commonly available font that might suit your purposes is the TTF version of the Computer Modern symbol font used by TeX and LaTeX. If you have it, it is probably named cmsy10.ttf
PostScript: "Symbol" is one of the core PostScript fonts that should supposedly always be available. The Italic variant, however, is not a standard PostScript font. If you have another font that would be acceptable, you can define Symbol-Italic as an alias for it (see documentation for your PostScript viewer).
PDF: PDF font aliases are managed in a file named pdflib.upr
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The enhanced text string you show "{/Symbol-Italic xxx}" requests a font named Symbol-Italic. If you have such a font available, it will work. If you have no such font, it won't work. Gnuplot does not provide its own fonts; it just passes the font name on to whatever output device you have selected.
The most commonly available font that might suit your purposes is the TTF version of the Computer Modern symbol font used by TeX and LaTeX. If you have it, it is probably named cmsy10.ttf
PostScript: "Symbol" is one of the core PostScript fonts that should supposedly always be available. The Italic variant, however, is not a standard PostScript font. If you have another font that would be acceptable, you can define Symbol-Italic as an alias for it (see documentation for your PostScript viewer).
PDF: PDF font aliases are managed in a file named pdflib.upr
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Thanks for information.
I think, I'm able to solve the problem now :)