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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 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 code in the group NXX for various other purposes.

  3. List of common display resolutions - Wikipedia

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

    800: ×: 480 5∶3: 5∶3: 1∶1: 384,000: W-PAL Wide PAL: 848: ×: 480 53∶30 : 16∶9: 1.006 407,040: FWVGA: List of mobile phones with FWVGA display: 854: ×: 480 427∶240 : 16∶9: 0.999 409,920: SVGA: Super VGA Nintendo Wii, Nintendo 64 HiRes, GameCube HiRes 800: ×: 600 4∶3: 4∶3: 1∶1: 480,000: qHD: Quarter FHD: AACS ICT, HRHD ...

  4. 800 MHz frequency band - Wikipedia

    en.wikipedia.org/wiki/800_MHz_frequency_band

    The 800 MHz frequency band is a portion of the electromagnetic spectrum, or frequency band, that encompasses 790–862 MHz. Being a part of the spectrum known as "UHF Bands IV and V" (i.e. 470 MHz to 862 MHz) it was allocated by the ITU to Broadcasting as the primary user in Region 1 and was used for analogue television broadcasting before ...

  5. 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, an Achilles number and the area of a square with diagonal 40.

  6. Hardness comparison - Wikipedia

    en.wikipedia.org/wiki/Hardness_comparison

    Hardness comparison table. Brinell HB. (10 mm Ball, 3000 kg load) Vickers HV. (5 kg) Rockwell C HRC. (120 degree cone 150 kg) Rockwell B HRB. (1/16" ball 100 kg)

  7. Toll-free telephone number - Wikipedia

    en.wikipedia.org/wiki/Toll-free_telephone_number

    Calling an 800-number is free of charge. Calling a 400-number incurs a local access charge. 800-numbers are accessible only to land-line subscribers, while 400-numbers are accessible to all land-line and mobile users. 800-toll-free numbers. 800 toll-free numbers are commonly called "800 免费电话".

  8. Comparison of Intel processors - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_Intel_processors

    800 MHz – 2.266 GHz Socket 479: 90 nm, 130 nm 5.5 W – 27 W 1 400 MHz, 533 MHz 32 KiB 1 MiB – 2 MiB N/A Pentium D/EE: 8xx 9xx Smithfield Presler: 2005–2008 2.66 GHz – 3.73 GHz Socket T: 65 nm, 90 nm 95 W – 130 W 2 533 MHz, 800 MHz, 1066 MHz 16 KiB per core 2×1 MiB – 2×2 MiB N/A Pentium Dual-Core: E2xxx E3xxx E5xxx T2xxx T3xxx

  9. Image resolution - Wikipedia

    en.wikipedia.org/wiki/Image_resolution

    For practical purposes the clarity of the image is decided by its spatial resolution, not the number of pixels in an image. In effect, spatial resolution is the number of independent pixel values per unit length. The spatial resolution of consumer displays ranges from 50 to 800 pixel lines per inch.

  10. National conventions for writing telephone numbers - Wikipedia

    en.wikipedia.org/wiki/National_conventions_for...

    Toll Free: These are usually ten digit numbers beginning with 800 or 400. 800 (toll-free) are accessible only when called from landline phones, while 400 (shared toll) are accessible from all phones. 400 XXX XXXX or 800 XXXX XXXX. Service numbers: These are usually 3- to 5-digit numbers (e.g. Police is 110) used to access an emergency service ...

  11. Number - Wikipedia

    en.wikipedia.org/wiki/Number

    A number is a mathematical object used to count, ... The earliest known use of irrational numbers was in the Indian Sulba Sutras composed between 800 and 500 BC.

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