It is a line in Geometry, meaning it has no beginning point or endpoint.
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this arrow ^ means "to the power of" E.g. 4^2 means 4 to the power of 2 the power is how many times it is times by itself. 4^2 is, two 4's multiplied together = 4 x 4 =16 4^3 is, three 3's multiplied together = 4 x 4 x 4 = 64
it means arrow ending
A U with an arrow through it on a diamond ring does not have a significant meaning. It is most likely an engraving or marking of some kind.
That's the formula for the area of a circle.
If shapes are equal then they are said to be congruent