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  2. 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 ...

  3. 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]

  4. UAN - Wikipedia

    en.wikipedia.org/wiki/UAN

    The combination of urea and ammonium nitrate has an extremely low critical relative humidity (18% at 30 °C) and can therefore only be used in liquid fertilizers. The most commonly used grade of these fertilizer solutions is UAN 32.0.0 (32%N) known as UN32 or UN-32, which consists of 45% ammonium nitrate , 35% urea and only 20% water.

  5. Labeling of fertilizer - Wikipedia

    en.wikipedia.org/wiki/Labeling_of_fertilizer

    The NPK analysis label. Fertilizers are usually labeled with three numbers, as in 18-20-10, indicating the relative content of the primary macronutrients nitrogen (N), phosphorus (P), and potassium (K), respectively. More precisely, the first number ("N value") is the percentage of elemental nitrogen by weight in the fertilizer; that is, the ...

  6. Oklahoma City bombing - Wikipedia

    en.wikipedia.org/wiki/Oklahoma_City_bombing

    Events Planning Motive McVeigh and Nichols cited the federal government's actions against the Branch Davidian compound in the 1993 Waco siege (shown above) as a reason why they perpetrated the Oklahoma City bombing. The chief conspirators, Timothy McVeigh and Terry Nichols, met in 1988 at Fort Benning during basic training for the U.S. Army. McVeigh met Michael Fortier as his Army roommate ...

  7. North Hollywood shootout - Wikipedia

    en.wikipedia.org/wiki/North_Hollywood_shootout

    Due to the large number of injuries and rounds fired, equipment used by the robbers, and overall length of the shootout, it is regarded as one of the most intense and significant gun battles in U.S. police history. Combined, the two men had fired approximately 1,100 rounds in total, while approximately 650 rounds were fired by police.

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