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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. Comparison of Dewey and Library of Congress subject ...

    en.wikipedia.org/wiki/Comparison_of_Dewey_and...

    Comparison of Dewey and Library of Congress subject classification. This is a conversion chart showing how the Dewey Decimal and Library of Congress Classification systems organize resources by concept, in part for the purpose of assigning call numbers. These two systems account for over 95% of the classification in United States libraries, and ...

  4. Toll-free telephone number - Wikipedia

    en.wikipedia.org/wiki/Toll-free_telephone_number

    800 toll-free numbers are commonly called "800 免费电话". The official name is "被叫集中付费业务" (called party collect paid service), which means the cost of the call is borne not by the caller but by the party receiving the call. 800-toll-free numbers in China are ten-digit numbers beginning with "800". There is no prefix before ...

  5. Histogram - Wikipedia

    en.wikipedia.org/wiki/Histogram

    This histogram shows the number of cases per unit interval as the height of each block, so that the area of each block is equal to the number of people in the survey who fall into its category. The area under the curve represents the total number of cases (124 million). This type of histogram shows absolute numbers, with Q in thousands.

  6. List of common display resolutions - Wikipedia

    en.wikipedia.org/wiki/List_of_common_display...

    This bit of marketing obfuscation is calculated as horizontal resolution × vertical resolution × 3. For example: 640 × 480 VGA is 921,600 subpixels, or 307,200 pixels, 800 × 600 SVGA is 1,440,000 subpixels, or 480,000 pixels, and 1024 × 768 XGA is 2,359,296 subpixels, but only 786,432 full-color pixels. ^ Apple Computer 1 megapixel standard.

  7. Wide Area Telephone Service - Wikipedia

    en.wikipedia.org/wiki/Wide_Area_Telephone_Service

    Initially 1‑800‑NN2‑XXXX numbers were U.S. intrastate and specific prefixes (such as 1‑800‑387 Toronto and 1‑800‑267 Ottawa) were assigned to Canada. [7] In the 1970s, AT&T's internal routing guides included separate U.S. and Canadian 1-800 exchange maps which looked much like area code maps [ 8 ] as each geographic area code had ...

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