Alert measurement systems

symbol which represents the likelihood of a man-made global catastrophe

thumb|DEFCON levels|355x355px The defense readiness condition (DEFCON) is an alert state used by the United States Armed Forces. The DEFCON system was developed in 1959 by the Joint Chiefs of Staff (JCS) and unified and specified combatant commands. It prescribes five graduated levels of readiness (or states of alert) for the U.S. military. It increases in severity from DEFCON 5 (least severe) to DEFCON 1 (most severe) to match varying military situations, with DEFCON 1 signaling the impending outbreak of nuclear warfare. For security reasons, the U.S. military does not announce a DEFCON level

measure of hazard posed by near-Earth objects

measure of hazard posed by near-Earth objects

thumb|French Army [[Land Rover Defender Vigipirate door marking.]] thumb|Soldiers of the French Army on patrol at [[Strasbourg station 19 August, 2013.]] Vigipirate (, ) is France's national security alert system. Created in 1978 through interministerial sessions and falling within the responsibilities of the prime minister, it has since been updated three times: in 1995 (following a terror bombing campaign), 2000 and 2004.

condition of armed forces and their constituent units and equipment

indication of the state of readiness of the armed forces for military action or a state against natural disasters, terrorism or military attack

public countdown that gives an approximation of what we are close to get 1.5C° (34F) of climate

former alert state of the UK

WATCHCON (Watch Condition) is an alert state system used by and coordinated between the South Korean armed forces and United States Department of Defense to measure reconnaissance posture, utilized often in matters concerning North Korea.