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  2. Police code - Wikipedia

    en.wikipedia.org/wiki/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 other status ...

  3. de Bruijn sequence - Wikipedia

    en.wikipedia.org/wiki/De_Bruijn_sequence

    For example, a digital door lock with a 4-digit code (each digit having 10 possibilities, from 0 to 9) would have B (10, 4) solutions, with length 10 000. Therefore, only at most 10 000 + 3 = 10 003 (as the solutions are cyclic) presses are needed to open the lock, whereas trying all codes separately would require 4 × 10 000 = 40 000 presses.

  4. IFF Mark X - Wikipedia

    en.wikipedia.org/wiki/IFF_Mark_X

    This is sometimes known as the "mission signal" and set by the air controllers prior to flight. In Mode 2 and 3, all 4096 possible 4-digit codes from 0000 to 7777 are allowed. [21] For Mode 3/A, the value of each of the digits, 0 to 7, is set through front-panel switches. For civilian use this is a code provided by the ATC controllers.

  5. Emergency service response codes - Wikipedia

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

    Code 3: Respond to the call using lights and sirens. Code 2: Respond to the call with no lights or sirens. The term "Code 4" is also occasionally considered a response code, though it generally only means "call has been handled or resolved, no further units respond". Certain agencies may add or remove certain codes.

  6. Gray code - Wikipedia

    en.wikipedia.org/wiki/Gray_code

    It is possible to construct binary Gray codes with n bits ... base = 10, digits = 4 // output: baseN[] = [0,0,9 ... of a balanced n-digit Gray code such that the ...

  7. Aiken code - Wikipedia

    en.wikipedia.org/wiki/Aiken_code

    Aiken code (symmetry property) Aiken code in hexadecimal coding. The following weighting is obtained for the Aiken code: 2-4-2-1. One might think that double codes are possible for a number, for example 1011 and 0101 could represent 5. However, here one makes sure that the digits 0 to 4 are mirror image complementary to the numbers 5 to 9.

  8. List of binary codes - Wikipedia

    en.wikipedia.org/wiki/List_of_binary_codes

    This is a list of some binary codes that are (or have been) used to represent text as a sequence of binary digits "0" and "1". Fixed-width binary codes use a set number of bits to represent each character in the text, while in variable-width binary codes, the number of bits may vary from character to character.

  9. Finger binary - Wikipedia

    en.wikipedia.org/wiki/Finger_binary

    In the binary number system, each numerical digit has two possible states (0 or 1) and each successive digit represents an increasing power of two. Note: What follows is but one of several possible schemes for assigning the values 1, 2, 4, 8, 16, etc. to fingers, not necessarily the best. (see below the illustrations.):