A marked credit card generally refers to the three-digit security code on the face of the credit card. This security code is set by the credit card company to protect consumers' transaction security. When shopping online or making purchases from unfamiliar merchants, you need to enter your credit card number, expiration date, and credit card symbol to complete the transaction. Therefore, credit card symbols protect consumers’ financial security to a certain extent.

Credit card symbols are used on e-commerce platforms such as Alipay and Taobao. When making a payment, you need to enter three pieces of information: credit card number, expiration date and credit card symbol. When making purchases offline, some merchants use traditional POS machines to take photos and enter credit card information, while some logistics companies require credit card information to be sent in the form of text messages. However, when using credit cards, you must pay attention to information security to prevent credit card information leakage and fraud.

Protecting personal information is something that everyone should pay attention to, especially important information such as credit card symbols. First of all, don’t leak your credit card information online or send it to strangers. Secondly, when entering credit card information, try to choose a formal e-commerce platform or merchant. Finally, do not let strangers borrow credit cards for consumption to avoid being defrauded of personal information and property. In short, protecting credit card symbols is an important part of protecting the security of personal information and needs to be paid attention to by every consumer.