Edit:
As the icons listed on the website are slightly outdated, here’s the correct resources:
- Material Design Icons DX – (forked version)
The old Material.io link now redirects to the Icons page on Google Fonts.
Isn’t it Material Icons (as stated by @RobbyCornelissen)? The Google Material Design team had recently (last month) updated their website.
Anyways, the Angular Material team expects developers to include the Google Material Design Icon Font themselves (Google Fonts/self-host/whatever you fancy).