The upside down horseshoe symbol is of Greek origin and is used to calculate many different types of problems. The symbol expresses the unlucky nature of the problem at hand.
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Leaving in terms of pi means, through out the whole answer you have the pi symbol when you sub and compute. So basically heres an example: 2pir r=14 2pi14 28pi your answer is 28 with the pi symbol on the right but I dont know how to write it on the computer was that of help?
The symbol of a square inside of a square for electrical purposes means double insulated.
A sideways 8 is the symbol for infinity
that symbol means trademark
That's the formula for the area of a circle.