It means your online.
imedient messege
green means available. clear means idle.
What does it mean
It is the symbol for Alcoholics Anonymous.
a cirlce with a v inside it means that its a volt meter
A c inside a circle means "with" in medical terms.
Compass Rose
Usually, "Go this way."
Equality.
It's the symbol for anarchy.
Compass Rose
I believe a circle within a circle is not part of Braille - Braille consists of a series of dots arranged in patterns.