An LED Has two qualified prospects: the anode (positive) and the cathode (adverse). It is critical to attach the LED the best way all-around within a circuit—LEDs are polarized parts, and reversing the polarity will prevent them from working. The term first appeared in the English language in 1804. At https://www.uk-exhibitionstands.co.uk/product/desktop-roller-banners-stellar-a3/