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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 tallest buildings in the United States - Wikipedia

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

   This list ranks completed and topped-out buildings in the United States that stand at least 800 feet (244 m) tall, based on standard height measurement which includes spires and architectural details, but excludes antenna masts. An equal sign (=) following a rank indicates the same height between two or more buildings.

4. 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".

5. 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 ...

6. 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).

7. Comparison of ICBMs - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_ICBMs

   10 x 800 kt / 8730 kg: Unknown 1986 Yes Silo 220 m 4 UR-100N UTTKh: USSR Khrunichev Machine-Building Plant: 10,000 km 105,600 kg 6 x 550 kt / 4350 kg Active: 1977: Yes: Silo 350-500m 5 RT-2PM Topol: USSR Votkinsk Machine Building Plant: 10,500 km 45,100 kg 800 kt Active 1985 No Road-mobile TEL: 200–900 m 6 RT-2PM2 Topol-M: Russia