Favicon

Favicons allow you to customize the icon users see next to your site name in a browser tab or bookmark. To install a custom favicon, access the More menu (three dots) and select Add favicon. You can upload a favicon or select one from Drive. Note the favicon will not be visible to users until you publish your site. Access Settings → Brand images → Favicon

Try using Iconfinder or Noun Project to find simple images to use for favicons.