As far as I know it's red, yellow, and green (Even though I see it as red, orange, orange), I didn't know you could see if is was put online or not in the icon without hovering over it?
Anyway, the best would probably be an icon that changes more than its color. Like, the square around the W could work like a progress bar;
No square - Red
Half a square - Yellow
Full square - Geen
I don
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