I’ve seen examples of two different “prefixes” used in the “icon” field of a lovelace dashboard: “mdi” and “hass”. For example “mdi:run” produces a nice icon. In that case, “hass:run” seems to work as well. “mdi” seems to be an obvious reference to “material design” icons, and most seem to work just fine for me (referencing https://materialdesignicons.com/).
Are the “mdi” and “hass” prefixes truly equivalent to each other ? Are there other legal/useful prefixes ?