An LED has two qualified prospects: the anode (optimistic) and the cathode (detrimental). It is crucial to attach the LED the best way around inside of a circuit—LEDs are polarized components, and reversing the polarity will prevent them from Operating. The term first appeared inside the English language in 1804. https://www.uk-exhibitionstands.co.uk/product/air-inflatable-backlit-circular-tower-2m-2280mm-h/