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  2. Toll-free telephone numbers in the North American Numbering ...

    en.wikipedia.org/wiki/Toll-free_telephone...

    Toll-free telephone numbers in the North American Numbering Plan. Toll-free telephone numbers in the North American Numbering Plan have the area code prefix 800, 833, 844, 855, 866, 877, and 888. Additionally, area codes 822, 880 through 887, and 889 are reserved for toll-free use in the future. 811 is excluded because it is a special dialing ...

  3. List of tallest buildings in the United States - Wikipedia

    en.wikipedia.org/wiki/List_of_tallest_buildings...

    One World Trade Center (center) in New York City is the tallest building in the Western Hemisphere. 8 Spruce Street can be seen on the right. The world's first skyscraper was built in Chicago in 1885. Since then, the United States has been home to some of the world's tallest skyscrapers. New York City, and especially the borough of Manhattan ...

  4. Toll-free telephone number - Wikipedia

    en.wikipedia.org/wiki/Toll-free_telephone_number

    In Portugal, the prefix is "800" so the 9-digit number is "800 xxx xxx". It is referred as chamada gratuita (free call) or as número verde (green number). In Qatar, toll-free numbers have the format "800' xxxx". [20] In Romania, toll-free numbers have the format "0800 xxx xxx". The service is referred to as număr verde.

  5. Hardness comparison - Wikipedia

    en.wikipedia.org/wiki/Hardness_comparison

    Hardness comparison. A variety of hardness -testing methods are available, including the Vickers, Brinell, Rockwell, Meyer and Leeb tests. Although it is impossible in many cases to give an exact conversion, it is possible to give an approximate material-specific comparison table for steels .

  6. Comparison of ICBMs - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_ICBMs

    800 kt Active 1985 No Road-mobile TEL: 200–900 m 6 RT-2PM2 Topol-M: Russia: Votkinsk Machine Building Plant 11,000 km 47,200 kg 800 kt Active 1994 No Silo, road-mobile TEL 200 m 7 RS-24: Russia Votkinsk Machine Building Plant 12,000 km 49,000 kg 3-4 x 300 kt Active 2007 Yes Silo, road-mobile TEL 150 m 8 R-29R: Russia State Rocket Center Makeyev

  7. Elo rating system - Wikipedia

    en.wikipedia.org/wiki/Elo_rating_system

    The Elo[ a] rating system is a method for calculating the relative skill levels of players in zero-sum games such as chess or esports. It is named after its creator Arpad Elo, a Hungarian-American physics professor. The Elo system was invented as an improved chess-rating system over the previously used Harkness system, [ 1] but is also used as ...

  8. List of European countries by average wage - Wikipedia

    en.wikipedia.org/wiki/List_of_European_countries...

    The countries and territories on the map have a net average monthly salary (adjusted for living costs in PPP) of: Purple. above $4,000. Green. $3,000 to $3,999. Blue. $2,000 to $2,999. Orange. $1,499 to $1,999.

  9. 800 (number) - Wikipedia

    en.wikipedia.org/wiki/800_(number)

    800 (eight hundred) is the natural number following 799 and preceding 801. It is the sum of four consecutive primes (193 + 197 + 199 + 211). It is a Harshad number ...

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