What is the meaning of x in ray?

In the context of rays (such as light rays or X-rays), the letter "x" does not typically hold a specific meaning. The term "ray" itself refers to a straight line or path along which waves or particles propagate, such as light or radiation.

The usage of the letter "x" is more prevalent in mathematical equations or coordinate systems when describing the properties or behavior of rays. For example, in optics, "x" may be used as a variable to represent distances, angles, or positions related to a ray's propagation or interaction with various surfaces or objects.