It could be the Greek letter "mu", which stands for micro = 1 millionth.
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.
In mathematics, an upside down A means "for all".
A upside down rainbow means cheese or tacos
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The Upside down T symbol indicates perpendicular lines.
pnworhd is an upside down pyramid. If you take pnworhd in script and turn in upside down you will get pyramid
The upside down purple triangle was actually used to identify Jehovah's Witnessess
It means un-polo if it's an upside down p with a small diamond next to it.
Anokatoprosopus means upside-down face (i.e. some aliens or monsters have upside-down faces).
upside down pirate flag was flown to mean No quarter," we're going to kill all aboard".
It's to do with "The Hum"