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  2. Service number (United States Army) - Wikipedia

    en.wikipedia.org/wiki/Service_number_(United...

    A military service number of the Regular Army. Service numbers were used by the United States Army from 1918 until 1969. Prior to this time, the Army relied on muster rolls as a means of indexing enlisted service members while officers were usually listed on yearly rolls maintained by the United States War Department.

  3. Social Security number - Wikipedia

    en.wikipedia.org/wiki/Social_Security_number

    In the United States, a Social Security number ( SSN) is a nine-digit number issued to U.S. citizens, permanent residents, and temporary (working) residents under section 205 (c) (2) of the Social Security Act, codified as 42 U.S.C. § 405 (c) (2). The number is issued to an individual by the Social Security Administration, an independent ...

  4. 24-hour analog dial - Wikipedia

    en.wikipedia.org/wiki/24-hour_analog_dial

    Using the numbers from 0 to 23 (or 1 to 24) to mark the day is the 24-hour clock system. Sundials use 24-hour analog dials—the shadow traces a path that repeats approximately once per day. Many sundials are marked with the double-XII or double-12 system, in which the numbers I to XII (or 1 to 12) are used twice, once for the morning hours ...

  5. Personal Public Service Number - Wikipedia

    en.wikipedia.org/wiki/Personal_Public_Service_Number

    The Personal Public Service Number ( PPS Number or simply PPSN) ( Irish: Uimhir Phearsanta Seirbhíse Poiblí, or Uimh. PSP) is a unique identifier of individuals in Ireland. It is issued by the Client Identity Services section of the Department of Social Protection, on behalf of Ireland's Minister for Social Protection .

  6. 24 Hour Fitness - Wikipedia

    en.wikipedia.org/wiki/24_Hour_Fitness

    24 Hour Fitness is a privately held and operated fitness center chain headquartered in Carlsbad, California. It is the second largest fitness chain in the United States based on revenue after LA Fitness , [3] and the fourth in number of clubs (behind LA Fitness , Anytime Fitness & Gold's Gym ), [4] operating 287 clubs across 11 U.S. states.

  7. 24 (number) - Wikipedia

    en.wikipedia.org/wiki/24_(number)

    24 is the third nonagonal number. 24's digits in decimal can be manipulated to form two of its factors, as 2 * 4 is 8 and 2 + 4 is 6. In turn 6 * 8 is 48, which is twice 24, and 4 + 8 is 12, which is half 24. 24 is a congruent number, as 24 is the area of a right triangle with a rational number of sides. 24 is a semi-meandric number, where an ...

  8. Port (computer networking) - Wikipedia

    en.wikipedia.org/wiki/Port_(computer_networking)

    Port (computer networking) In computer networking, a port or port number is a number assigned to uniquely identify a connection endpoint and to direct data to a specific service. At the software level, within an operating system, a port is a logical construct that identifies a specific process or a type of network service.

  9. Hexadecimal - Wikipedia

    en.wikipedia.org/wiki/Hexadecimal

    In mathematics and computing, the hexadecimal (also base-16 or simply hex) numeral system is a positional numeral system that represents numbers using a radix (base) of sixteen. Unlike the decimal system representing numbers using ten symbols, hexadecimal uses sixteen distinct symbols, most often the symbols "0"–"9" to represent values 0 to 9 ...