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What do the two dots after the six digits of the verification code represent?

It's boring that the SMS verification code is received in the form of SMS. It's a 4-digit or 6-digit password, and two dots don't mean anything. SMS verification code is an effective verification code system by sending verification codes to mobile phones. Both large websites, especially shopping websites, have the verification code function of SMS, which can ensure the safety of shopping more accurately and safely and verify the correctness of users.