If by "arrow" you mean "carat" (>) the carat means "greater than" and if underlined means "greater than or equal to"
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⇒ is used for material implication i.e. implies; if .. then
It is the point at which a line segment ends!
The line above the number means in Math Terms that the number is repeditive and goes on and never stops.
It is the equation of a straight line plotted on the Cartesian plane.
A line that bisects a circle and goes through the center of it is the diameter.