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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. 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.

  4. List of tallest buildings and structures - Wikipedia

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

    The second-tallest structure in the world is the 679-metre-tall (2,227 ft) Merdeka 118 in Kuala Lumpur, Malaysia, while the third-tallest self-supporting structure and the tallest tower in the world is the Tokyo Skytree (634 m or 2,080 ft). The tallest guyed structure is the KRDK-TV mast in North Dakota, U.S. at 630 metres (2,060 ft).

  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. 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 ...

  7. 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

  8. List of numbers - Wikipedia, the free encyclopedia

    en.wikipedia.org/wiki/List_of_numbers

    A list of articles about numbers (not about numerals). Topics include powers of ten, notable integers, prime and cardinal numbers, and the myriad system.

  9. 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.

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