| Code | Meaning |
|---|---|
| ETA | Estimated Time of Arrival. |
| Affirmative | Yes or confirmation. |
| Backup | Request for additional police units. |
| Negative | No or disagreement. |
| All units | Alerting all available officers to a situation. |
| BOLO | Be on the lookout (used to describe wanted persons or vehicles). |
| Signal 1: | Officer in trouble – urgent assistance required. |
| Signal 100: | Radio silence – used during emergencies or critical situations. |