Material Icons are the icon set from Google that are designed under the material design guidelines.
Material Icons fonts by default uses a typographic feature called ligatures, which allows rendering icons by using its textual name.
Material Design Icons by @mervick/mdi-icons implements the ability to use the icons by CSS classes instead of ligatures.
There are 5 themes (fonts) available: Filled (Regular), Outlined, Rounded, Two-Tone and Sharp