As the icons listed on the website are slightly outdated, here is a forked list of the icons, maintained and updated by Jossef Harush Kadouri
- Material Design Icons DX (MDIDX)
The old Material.io link now redirects to the Icons page on Google Fonts.
There is also another icon font by Google that supports variable fonts which you can find on the same page by clicking on the Material Symbols option.
Anyway, the Angular Material team expects developers to include the Google Material Design Icon Font themselves (Google Fonts/self-host/whatever you fancy).