Threat level is a term used by governments to indicate the state of preparedness required by government servants with regard to threats to the state:
Current
edit- UK Threat Levels, the system used by the United Kingdom since 2006
- National Terrorism Advisory System, the system used by the United States since 2011
Former
edit- BIKINI state, the system used by the United Kingdom 1970–2006
- Homeland Security Advisory System, the system used by the United States 2002–2011