Nothing it just has a capital letter
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there is not much difference
There is no difference in meaning between the two. It is usually spelled in lowercase, though (arc tan, or arctan).
In a circle what is the difference between a central angle and an arc?Read more: In_a_circle_what_is_the_difference_between_a_central_angle_and_an_arc
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Arc measure is the number of radians. Two similar arcs could have the same arc measure. Arc length is particular to the individual arc. One must consider the radius of the arc in question then multiply the arc measure (in radians) times the radius to get the length.