As Might be found within the image, the LED symbol body contains a diode image with two arrows. The 2 arrows denote that gentle is emitted from this device. An LED has an anode and cathode terminal. Inside the picture, the anode is around the left and cathode on the https://www.uk-exhibitionstands.co.uk/product/monolith-3m-display-wall-3x2-4/