What does the letter P on the SMS sign mean?

This is a push message. When the mobile phone receives this push information, it will display a short message sign or a "P" sign on the display screen. When viewing, some machines enter from "Internet-Browser-Push Inbox"; Some machines enter from the "information push inbox". Check this information and press OK directly to open this link. You can surf the internet through your mobile phone to reach the designated website (there may be a charge). If you don't need to view it, delete all the contents of the empty push inbox directly, and the icon on the display screen will disappear; If you don't want to receive this kind of information, you can select "No" in "Settings-Push Inbox-Inbox Settings-Receive Push Information" under the browser, and you won't receive this kind of information.