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  2. Gold certificate (United States) - Wikipedia

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

    The $100,000 bill, a gold certificate from Series 1934, is the largest denomination banknote ever produced in the United States; it was printed to facilitate transactions between Federal Reserve Banks, and was never issued for usage by the public. Gold certificates were first authorized under the Legal Tender Act of 1863, but unlike the United ...

  3. Nines (notation) - Wikipedia

    en.wikipedia.org/wiki/Nines_(notation)

    Nines (notation) 1 troy ounce of four nines fine gold (999.9) Nines are an informal logarithmic notation for proportions very near to one or, equivalently, percentages very near 100%. Put simply, "nines" are the number of consecutive nines in a percentage such as 99% (two nines) [1] or a decimal fraction such as 0.999 (three nines).

  4. Fineness - Wikipedia

    en.wikipedia.org/wiki/Fineness

    It is an extension of the older karat system of denoting the purity of gold by fractions of 24, such as "18 karat" for an alloy with 75% (18 parts per 24) pure gold by mass. The millesimal fineness is usually rounded to a three figure number, particularly where used as a hallmark , and the fineness may vary slightly from the traditional ...

  5. 0.999... - Wikipedia

    en.wikipedia.org/wiki/0.999...

    In mathematics, 0.999... (also written as 0.9, 0.. 9, or 0. (9)) denotes the smallest number greater than every number in the sequence (0.9, 0.99, 0.999, ...). It can be proved that this number is 1; that is, In other words, 0.999... is not "almost exactly 1" or "very, very nearly but not quite 1"; rather, 0.999... and "1" are exactly the same ...

  6. Five nines - Wikipedia

    en.wikipedia.org/wiki/Five_nines

    Five nines. Five nines, commonly taken to mean "99.999%", may refer to: High availability of services, when a service is available for 99.999% of the time, or around 5 minutes of downtime per year. Nine (purity), a 99.999% pure substance. German 15 cm (5.9 in) artillery shells used in World War I.

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