I was about to post the same link. They couldn't have thought of a worse name for it. IIRC when copper-plated steel 1p and 2p coins were introduced (up until

I was about to post the same link. They couldn't have thought of a worse name for it. IIRC when copper-plated steel 1p and 2p coins were introduced (up until then they were bronze), they caused havoc with vending machines, whose manufacturers weren't forewarned.