What symbol is used for Serious Error Notification in the NCIC protocol?

The symbol used for Serious Error Notification in the NCIC protocol is indeed represented by $S. This designation indicates to users of the NCIC system that a serious error has occurred, which requires immediate attention. This could relate to issues such as data integrity problems or system malfunctions that impact the reliability of the information.

Understanding the importance of this symbol is crucial for users, as it alerts them to potential problems that could affect the operations of law enforcement and other agencies relying on accurate data. Recognizing this type of error notification can lead to swift corrective actions, helping maintain the smooth functioning of the system and ensuring that agencies have access to reliable information.