What does the short message picture show?

It means that the text message has been sent to someone else.

If the picture short message is sent successfully, it will show that it has been delivered. If the other party is turned off or stopped, it will not be displayed unless the other party is turned on or the payment is not overdue.

Short message: ShortMessageService, referred to as short message service, refers to the text or digital information directly sent or received by users through mobile phones or other telecommunication terminals. The number of characters that users can send and receive SMS at a time is 160 English or numeric characters or 70 Chinese characters.