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  2. Emergency service response codes - Wikipedia

    en.wikipedia.org/wiki/Emergency_service_response...

    In the United States, response codes are used to describe a mode of response for an emergency unit responding to a call. They generally vary but often have three basic tiers: Code 3: Respond to the call using lights and sirens. Code 2: Respond to the call with emergency lights, but without sirens. Alternatively, sirens may be used if necessary ...

  3. Year 2000 problem - Wikipedia

    en.wikipedia.org/wiki/Year_2000_problem

    The year 2000 problem [1], or simply Y2K, refers to potential computer errors related to the formatting and storage of calendar data for dates in and after the year 2000. Many programs represented four-digit years with only the final two digits, making the year 2000 indistinguishable from 1900. Computer systems' inability to distinguish dates ...

  4. Ten-code - Wikipedia

    en.wikipedia.org/wiki/Ten-code

    Ten-codes, officially known as ten signals, are brevity codes used to represent common phrases in voice communication, particularly by US public safety officials and in citizens band (CB) radio transmissions. The police version of ten-codes is officially known as the APCO Project 14 Aural Brevity Code. [1]

  5. Communication during the September 11 attacks - Wikipedia

    en.wikipedia.org/wiki/Communication_during_the...

    The Emergency Alert System was never activated in the terrorist attacks, as the extensive media coverage made it unnecessary. AT&T eliminated any costs for domestic calls originating from the New York City area (phones using area codes 212, 718, 917, 646, and 347) in the days following 9/11. Radio communications

  6. Hospital emergency codes - Wikipedia

    en.wikipedia.org/wiki/Hospital_emergency_codes

    Hospital emergency codes are coded messages often announced over a public address system of a hospital to alert staff to various classes of on-site emergencies. The use of codes is intended to convey essential information quickly and with minimal misunderstanding to staff while preventing stress and panic among visitors to the hospital.

  7. Collapse of the World Trade Center - Wikipedia

    en.wikipedia.org/wiki/Collapse_of_the_World...

    The fires in each building had different attributes, as was evident in the responses and behavior of people trapped in each. Countless windows in the North Tower were smashed by occupants seeking relief from the hellish conditions inside. While some windows were broken in the South Tower, it was relatively uncommon by comparison.

  8. Police code - Wikipedia

    en.wikipedia.org/wiki/Police_code

    Police code. A police code is a brevity code, usually numerical or alphanumerical, used to transmit information between law enforcement over police radio systems in the United States. Examples of police codes include "10 codes" (such as 10-4 for "okay" or "acknowledged"—sometimes written X4 or X-4), signals, incident codes, response codes, or ...

  9. Northeast blackout of 2003 - Wikipedia

    en.wikipedia.org/wiki/Northeast_blackout_of_2003

    The first Ontario power plants go offline in response to the unstable voltage and current demand on the system. 4:10:46 p.m. The New England grid separates from New York, to stop the black out from entering New England. 4:10:50 p.m. Ontario separates from the western New York grid. 4:11:57 p.m.