They’re small hexagon stickers — sometimes black, sometimes white — each with a letter. You’ll spot them on your car’s charging port and on charge points. They’re a simple visual guide to check you’ve chosen the right way to plug in: just match the car’s hexagon to the one on the charge point. Job done.
Black hexagons are on the vehicle; white ones are on the charge point.
For most people, the letters don’t matter much — they indicate voltage ranges and connector types. If you fancy the finer details, the official Fuel Identifiers site has the lot.
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