Roentgen Rays are a form of electromagnetic radiation that passes through solid objects and causes them to emit visible light. They were discovered by the German physicist Wilhelm Roentgen in 1895 and named after him. Today, Roentgen Rays are commonly referred to as X-rays, after the mathematical symbol X that Roentgen used to describe them. Other synonyms for Roentgen Rays include diagnostic radiation, radiographic imaging, and radiography. These terms are frequently used in medical contexts, where doctors and other healthcare professionals use X-ray technology to diagnose and treat various conditions. Despite the different names used to describe them, Roentgen Rays remain an important tool for modern medicine.