® = Option (alt) + R
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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 ~
it looks like =with a~ over it
The congruence symbol was invented by Gottfried Leibniz.
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 capital A is usually used as a symbol for area in math.