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0 ( zero) is a number representing an empty quantity. Adding 0 to any number leaves that number unchanged. In mathematical terminology, 0 is the additive identity of the integers, rational numbers, real numbers, and complex numbers, as well as other algebraic structures.
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20 U.S.C. ch. 5—Government Collections and Institutions for Research, and Material for Educational Institutions; 20 U.S.C. ch. 6—American Printing House for the Blind; 20 U.S.C. ch. 6A—Vending Facilities for Blind in Federal Buildings; 20 U.S.C. ch. 7—Instruction as to Nature and Effect of Alcoholic Drinks and Narcotics; 20 U.S.C. ch. 8 ...
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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 ...
The police version of ten-codes is officially known as the APCO Project 14 Aural Brevity Code. [1] The codes, developed during 1937–1940 and expanded in 1974 by the Association of Public-Safety Communications Officials-International (APCO), allow brevity and standardization of message traffic. They have historically been widely used by law ...