A single marker for use in recording either of two different characters, an “R” or an “L,” on an x-ray image, corresponding to the “left” or “right” side exposure area of the anatomical part(s) of a patient. The marker consists of four embodiments, a base marker, a swivel marker, a hinge marker, or a slider marker, which selectively indicate either the “R” or “L” exposure area of the patient. In addition, the marker also glows in the dark to facilitate usage in poorly lit areas and includes a radiopaque frame within its base to help the x-ray technician confirm that the technician is not viewing image artifacts.
