What does the 00 in front of the message mean?

00 is an international telephone call prefix, which means to make an international long-distance call. Internationally, different countries have different telephone prefixes. For example, the United States uses 0 1 1, Britain uses 00, and Chinese mainland uses 00 or +86. If you want to make an international call, remember to add 00 or+in front of it, otherwise you may not be able to get through.

The prefix 00 also has other meaning. For example, in the aviation and railway industries, 00 is the "zero point" for the delivery time. "Zero" means noon or midnight. You can check the specific timetable at your respective station or airport. If you take an international flight or train, you need to know the relevant departure time and prefix to avoid missing the plane or train.

Besides telephone and transportation, prefix 00 has other uses. In computer programming, 00 refers to the number 0 in the hexadecimal number system. In some games, players will also use this number as a code name or key. In a word, prefix 00 has different meanings and uses in different fields, and we need to understand and use it according to the specific situation.