E12 is a designation used in various contexts, but it is most commonly associated with the European Union standard for electrical equipment. This standard specifies the dimensions and performance requirements for certain types of electrical connectors, ensuring compatibility and safety across different devices. In the automotive industry, E12 can refer to a specific type of light bulb used in vehicle lighting systems. These bulbs are typically small and used in applications like dashboard lights and interior illumination, providing essential visibility for drivers and passengers.