The chemical symbol for cadmium is Cd. Cadmium is a transition metal and is recognized for its bright, silvery appearance. It has an atomic number of 48 and is primarily used in batteries, particularly nickel-cadmium batteries, as well as in coatings, pigments, and certain types of plastics. Cadmium is relatively rare in the Earth's crust but can pose significant health risks upon exposure, especially for workers in industrial settings. Its use has decreased due to environmental regulations and concerns about toxicity, leading to increased interest in alternative materials for applications previously reliant on cadmium.