Usually an upside down umbrella catching raindrops or tears is seen as a sign of compassion. In both Hinduism and Buddhism, umbrellas or parasols are a symbol of wisdom.
Yes it is very good luck. I know this because when i did this in class i managed to prove my mate wrong, as the luck was i stumbled on to this question on Answers.com and nothing bad happened :)
In mathematics, an upside down A means "for all".
A upside down rainbow means cheese or tacos
Sound like a passion flower vine
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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.