They represent the binary values zero and one, which are traditionally associated with logical "LO", "False", or "OFF" and "HI", "True", or "ON", respectively. In this context, they mean "OFF" and "ON".There are two symbols "I" and "O" on most power switches
What do these two symbols mean?
Industrially there are two schools of thought regarding green and red indications.I just see the colour Green= On and Red = Off. It's better than I and O.
A classic inversion if work / life imbalance. Then the employee takes this experience home and their spouse thinks they are complete idiots because they don't know the green light means the power is on.The other is:
Green = safe (off)
Red = danger (on)
It seems to break down by industry.
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by Jake Hertz