Starfleet Codes

Code 1: signals either a total or imminent disaster, a possible invasion, or indicates that the Federation is either currently or about to be engaged in open warfare with a hostile power. The code requires all Starfleet personnel within the affected area to immediately assume a 'war' footing or posture. It is also colloquially known as "Defense Alert", or a "Priority One Alert".
Code 1-Alpha-Zero: Indicates a starship in distress. 
Code 7-10: a "quarantine code". No Starfleet or Federation-registered starship is to approach a system or vessel which is broadcasting Code 7-10.
Code 47: an ultra-secure communications protocol, for Captain's eyes only. So secure that all traces of a Code 47 transmission or communication are automatically wiped from all computer records.
category:regulations