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the distance from the origin
The distance that number is from zero on a number line.
It is the distance from the origin (point 0) to the given point, taking account of the scale.
The standard form of a complex number is the cartesian one; a plane with orthogonal axes for real parts and imaginary parts. A complex number has a pair of co-ordinates defining its position on the plane. A trigonometric form is a plane with an origin, and one line from the origin to infinity. A complex number is defined by its distance from the origin and the angle between the datum line and the line joining the number to the origin. It is just like co-ordinate geometry with co-ords r, theta instead of x,y.
The number line is scalable, meaning it can be any distance you want.