Under the National Incident Management System (NIMS), people are supposed to avoid use of acronyms and 10 codes on the radio, such as 10-4. (Though that one is probably OK). They vary too much from department to department, which inhibits communication in joint operations.They also can vary a wee bit in severity. For example, 10-89 can mean a bomb threat, but for the Salt Lake County Sheriff, it means stolen bicycle. Other examples:
