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chrysanthemum
Hello.

JK (or any other combination of letters) doesn't stand for anything in geometry. The purpose of these letters is to reference certain angles and sides of a figure without having to describe the angles/sides in relation to other angles/sides to know exactly which angle or side is being referenced.

Hope this helps!

Answer:

Normal. The math word 'normal' means to be at right angles, or meeting at 90° In the figure below the line JK is normal to AB. The usual way of saying this is that JK is perpendicular to AB.