Sometimes characters are displayed as “tofu” when text is not rendered by a computer properly . They are little boxes to indicate that your computer or mobile doesn’t have that font to display the text.
Noto fonts are another useful digital product from Google, and has been developing a font family, which is designed to support all languages with a perfect look and feel of original script. Google’s answer for tofu is Noto. as per google official statement the name Noto is to convey Google’s goal is to see “no more tofu”. Noto fonts available in multiple styles and weights, of course it is freely available to all. Create fancy username for Instagram or Whatsapp account using Unicode fonts
You can view and download all Noto fonts here for free: https://www.google.com/get/noto/