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What does -hico-di above the magnetic stripe of a credit card mean?
You know ISO91, which is an international quality system certification, and it is used to authenticate some products or services.

Bank cards use GSC16183-HiCoC67 This GSC is a general standard for credit cards, and the number of GSC+ is the general standard in the industry.

HiCo stands for strong magnetism, and the number after it should be magnetic code or strength code.