What is the name in brackets in front of SMS verification code?

For example, when you log in to Tik Tok, you need a verification code. At this point, after sending the verification code, Tik Tok is in brackets in front of the message.

Short message is text or digital information sent or received directly 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. Short message is a telecommunication service in digital mobile communication system. It is a non-real-time and non-voice data communication service to transmit text or digital short messages through the signaling channel and signaling network of mobile communication system.