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  2. Personal identification number - Wikipedia

    en.wikipedia.org/wiki/Personal_identification_number

    Personal identification number. A personal identification number ( PIN ), or sometimes redundantly a PIN number or PIN code, is a numeric (sometimes alpha-numeric) passcode used in the process of authenticating a user accessing a system. The PIN has been the key to facilitating the private data exchange between different data-processing centers ...

  3. Hamming distance - Wikipedia

    en.wikipedia.org/wiki/Hamming_distance

    Since the Hamming distance between "000" and "111" is 3, and those comprise the entire set of codewords in the code, the minimum Hamming distance is 3, which satisfies 2k+1 = 3. Thus a code with minimum Hamming distance d between its codewords can detect at most d-1 errors and can correct ⌊(d-1)/2⌋ errors.

  4. Hamming code - Wikipedia

    en.wikipedia.org/wiki/Hamming_code

    In mathematical terms, Hamming codes are a class of binary linear code. For each integer r ≥ 2 there is a code-word with block length n = 2r − 1 and message length k = 2r − r − 1. Hence the rate of Hamming codes is R = k / n = 1 − r / (2r − 1), which is the highest possible for codes with minimum distance of three (i.e., the minimal ...

  5. Distance from a point to a line - Wikipedia

    en.wikipedia.org/wiki/Distance_from_a_point_to_a...

    In Euclidean geometry, the distance from a point to a line is the shortest distance from a given point to any point on an infinite straight line. It is the perpendicular distance of the point to the line, the length of the line segment which joins the point to nearest point on the line. The algebraic expression for calculating it can be derived ...

  6. Postal Index Number - Wikipedia

    en.wikipedia.org/wiki/Postal_Index_Number

    A Postal Index Number ( PIN; sometimes redundantly a PIN code) [note 1] refers to a six-digit code in the Indian postal code system used by India Post. On 15 August 2022, the PIN system celebrated its 50th anniversary.

  7. ZIP Code - Wikipedia

    en.wikipedia.org/wiki/ZIP_code

    A 1974 postage stamp encouraging people to use the ZIP Code on letters and parcels. A ZIP Code (an acronym for Zone Improvement Plan [1]) is a system of postal codes used by the United States Postal Service (USPS). The term ZIP was chosen to suggest that the mail travels more efficiently and quickly [2] ( zipping along) when senders use the ...

  8. List of postal codes - Wikipedia

    en.wikipedia.org/wiki/List_of_postal_codes

    The postal code refers to the post office at which the receiver's P. O. Box is located. Kiribati: KI – no codes - Korea, North: KP – no codes - Korea, South: 2015-08-01 KR: NNNNN Previously NNN-NNN (1988~2015), NNN or NNN-NN (1970~1988) Kosovo: XK: NNNNN A separate postal code for Kosovo was introduced by the UNMIK postal administration in ...

  9. Piston motion equations - Wikipedia

    en.wikipedia.org/wiki/Piston_motion_equations

    The reciprocating motion of a non-offset piston connected to a rotating crank through a connecting rod (as would be found in internal combustion engines) can be expressed by equations of motion. This article shows how these equations of motion can be derived using calculus as functions of angle ( angle domain) and of time ( time domain) .

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