Symbols above repair bar

[lufia22]

What do the different symbols and colors mean? Obviously the fast forward one is improved repair speed, but what do the colors mean? I've seen yellow and read but don't know what the difference is. There's also one that looks like a thermostat or an air pressure meter. Might be some other too. Is there a list somewhere?

[dumpworth]

https://deadbydaylight.gamepedia.com/Status_HUD

Look under "Proficiency Indicators"