How to install Tamil Font of vanavil avvaiyar

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In all over India major of government organisations and private sectors using VANAVIL AVVAIYAR FONT. So kindly do the needful fair installing font

Apple is not involved in this. You install it yourself using an app like AnyFont.

But if this font does not follow the Unicode standard (which I suspect is the case), it will not be supported or usable on Apple devices and apps. Apple already supplies Unicode Tamil fonts with its products.