i want to know how many arabic font in indesign

As @kglad mentioned, when you add fonts in your OS, InDesign will show them. Having said that, when you install the Middle Eastern version of Adobe InDesign, a few Arabic fonts will be installed including… Adobe Arabic, Myriad Arabic, and Adobe Naskh to name a few.

Well, the number of Arabic fonts in InDesign is dependent on the number of Arabic fonts you have installed on your computer. You can add some Arabic fonts via fonts.adobe.com as a part of your Creative Cloud subscription; if I go to All Fonts and pick Arabic as a language, I see that there are currently 39 font families available that support Arabic.  100% of those fonts should work cross-platform on Windows and Mac.

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