The symbol is three vertical lines next to each other the symbol above is the symbol for approximately equal to.
Wrong, the correct symbol is ~
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A capital A is usually used as a symbol for area in math.
The symbol is two parallel, vertical lines. I don't believe that it is directly related to the equal symbol; although it is possible that the vertical position was chosen precisely to avoid confusion.
a squiggly equal sign
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.
it looks like =with a~ over it