Homonym: UV (Ultraviolet)
"UV" stands for ultraviolet light, a type of electromagnetic radiation that is invisible to the human eye. It is found in sunlight and is divided into three categories: UVA, UVB, and UVC. While UVA rays can penetrate deep into the skin and contribute to aging, UVB rays are primarily responsible for sunburn. UVC rays are mostly absorbed by the Earth's atmosphere and do not reach the surface.
UV light has various applications, including in sterilization processes, where it is used to kill bacteria and viruses. It is also utilized in tanning beds and in the production of vitamin D in the skin. However, excessive exposure to UV radiation can lead to skin damage and increase the risk of skin cancer.