A61 is a classification code used in the International Patent Classification (IPC) system. It specifically pertains to medical or veterinary science, focusing on the use of drugs and other therapeutic methods. This classification helps organize patents related to pharmaceuticals, treatments, and medical devices. Within the A61 category, various subcategories exist, covering topics such as pharmacology, surgery, and diagnostic methods. This system allows researchers, inventors, and legal professionals to easily locate and reference relevant patents, facilitating innovation and collaboration in the medical field.