It could be the Greek letter "mu", which stands for micro = 1 millionth.
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In mathematics, an upside down A means "for all".
The upside down purple triangle was actually used to identify Jehovah's Witnessess
Take a pyramid and turn it upside down so it is balanced on the point (pointed top), you have now turned a 3D shape upside down. Basically, upside down is to reverse the way the shape should normally appears.
Take a pyramid and turn it upside down so it is balanced on the point (pointed top), you have now turned a 3D shape upside down, vertically. Basically, upside down is to vertically reverse the way the shape should normally appears.
The hazard lights.