Sunscreen (also commonly known as sun screen, sunblock, suntan lotion, sunburn cream, sun cream or block out) is a lotion, spray, gel or other topical product that absorbs or reflects some of the sun's ultraviolet (UV) radiation on the skin exposed to sunlight and thus helps protect against sunburn. Dr. Rodney McKay used his homemade SPF 100 sunblock on a mission to P3M-736 to search for Lt. Aiden Ford. (SGA: "Runner")