A non-powered, noninvasive device intended to be placed within the field of view of a radiological device [diagnostic (e.g., x-ray) and/or radiation therapy] to produce an identifying mark [typically for an anatomical location (e.g., mole, nipple, lesion), orientation (e.g., right or left limb), or patient identification] on films or digital images; it is not intended to be used during surgery. It is typically in the form of a small sticker, clip, or plate, and is positioned on or next to the patient, or on the film cassette or holder; it is not intended to be placed on teeth. It is made from materials compatible with the imaging system. This is a reusable device.