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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.
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 changing to digital terrestrial television in many ...
A Casio DBC-610 Databank calculator watch. Casio DBA-800 Databank, the world's first phone dialer watch. Casio Databank (often styled as CASIO DATA BANK) is a series of digital watches and electronic personal organizers manufactured by Casio. The watches allow data storage for names and telephone numbers, memos, and in late editions, email ...
800–999: Class F; 600–799: Class G; 400–599: Class H; 200–399: Class I; 100–199: Class J; The K-factor used by the USCF. The K-factor, in the USCF rating system, can be estimated by dividing 800 by the effective number of games a player's rating is based on (N e) plus the number of games the player completed in a tournament (m).
Power supply. four AAA alkaline batteries. Weight. 213 grams. Graphic calculators made by Casio include the touchscreen ClassPad 300 as well as the models with traditional buttons which can be divided into two main generations listed below. Casio produced the world's first graphing calculator, the fx-7000G .
Basic calculators usually store only one number at a time; ... The first European-made pocket-sized calculator, DB 800 ... Comparison of HP graphing calculators;
Lower 800 n26 815 – 830 860 – 875 45 5, 10, 15 Japan n20: FDD 800: Digital Dividend: 832 – 862 791 – 821 −41 5, 10, 15, 20 EU n24: FDD 1600: Upper L-band: 1626.5 – 1660.5: 1525 – 1559: −101.5 5, 10 US n25: FDD 1900: Extended PCS: 1850 – 1915 1930 – 1995 80 5, 10, 15, 20, 25, 30, 35, 40, 45: n26: FDD 850 Extended CLR 814 ...
Name Software license OS Support Precision Hex/oct/bin mode Defining variables Defining functions Syntax highlighting Unit conversion Multiple Steps
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".
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.