An upside-down umbrella often symbolizes bad luck or misfortune, as it suggests that something is not functioning as intended. In some cultures, it may represent a need for protection from negative forces or a warning against tempting fate. Additionally, it can serve as a metaphor for unexpected challenges or a situation that is out of control.
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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pnworhd is an upside down pyramid. If you take pnworhd in script and turn in upside down you will get pyramid
The Upside down T symbol indicates perpendicular lines.
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IgLoo
The upside down purple triangle was actually used to identify Jehovah's Witnessess
Anokatoprosopus means upside-down face (i.e. some aliens or monsters have upside-down faces).