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.
If shapes are equal then they are said to be congruent
That's the formula for the area of a circle.