This little note on the back of the bank card is very useful. I suggest that you don't tear it off or damage it at will, otherwise there may be many unexpected troubles. Generally speaking, this small piece of paper can be used for people to write their own names on it, or to write other specific marks to distinguish the types and uses of cards and facilitate the use and management of personal cards. It should be noted that there is a set of numbers behind the note, which is a specific inspection code. Generally, you don't need to use them, but you need to provide these numbers in case of unfreezing the bank card when reporting the loss or in other important occasions involving personal information. If you lose it, you will be in big trouble. So these should be properly kept.