As could be observed within the graphic, the LED image system is made of a diode symbol with two arrows. The 2 arrows denote that gentle is emitted from this system. An LED has an anode and cathode terminal. From the picture, the anode is around the remaining and cathode https://www.uk-exhibitionstands.co.uk/product-category/pop-ups-and-banner-stands/pop-up-walls/