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What do the last three signatures on the back of industrial and commercial bank cards mean?
The last three digits of the signature column of the bank card are CVV2 code.

The last three digits are called CVV2 code;

After the credit card is replaced, even if the card number is the same, the following CVV2 code will change. Just like the ID card of a credit card, you must keep it safe.

You can find a sticker to stick it up, so that others will not steal it when you swipe your card.