Very simple. Two parallel lines do not intersect.
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Two parallel lines, a plane and a line in a plane parallel to it.
Perpendicular Lines form right angles at their point of intersection
It is usually called an intersection or an intersection point.
In Euclidian geometry it's a point. In non-Euclidean geometry all bets are off.
It is the radius of bend of the elbow with reference to a point,the point is determined by the intersection of two lines from the elbows socket end (which makes the shape of one quater of a circle). The bend ie; 1.5d,3d,5d,10d is determined from that point of intersection as a multiple of elbows diameter.