| Code | Meaning |
|---|---|
| Affirmative | Yes or acknowledgment. |
| Negative | No or denial. |
| ETA | Estimated time of arrival. |
| Backup needed | Request for additional police units. |
| All units | Calling the attention of all available officers. |
| Proceed with caution | Warning to approach a situation carefully. |
| Standby | Wait or pause communication. |