An object that is manually configured and physically placed within the field of view of a medical or dental diagnostic imaging system [e.g., x-ray, magnetic resonance imaging (MRI), or nuclear medicine] and leaves identifying marks on either films or digital images created using various diagnostic imaging modalities. It can be positioned either on a patient's body, or next to a patient, or be affixed to the film cassette or holder. It is made from materials compatible with the imaging system with which it is intended to be used. Typically used to imprint information on the images related to image acquisition parameters and/or patient identification, and to record anatomical information.