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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.
This glossary of geography terms is a list of definitions of terms and concepts used in geography and related fields, including Earth science, oceanography, cartography, and human geography, as well as those describing spatial dimension, topographical features, natural resources, and the collection, analysis, and visualization of geographic ...
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.
A geographic number is a telephone number, from a range of numbers in the United Kingdom National Telephone Numbering Plan, where part of its digit structure contains geographic significance used for routing calls to the physical location of the network termination point of the subscriber to whom the telephone number has been assigned, or where ...
This page, Glossary of geography terms (N–Z), lists terms beginning with the letters N through Z. Related terms may be found in Glossary of geology , Glossary of agriculture , Glossary of environmental science , and Glossary of astronomy .
Altitude is a distance measurement, usually in the vertical or "up" direction, between a reference datum and a point or object. The exact definition and reference datum varies according to the context (e.g., aviation, geometry, geographical survey, sport, or atmospheric pressure).
The North American Numbering Plan ( NANP) is a telephone numbering plan for twenty-five regions in twenty countries, primarily in North America and the Caribbean. This group is historically known as World Zone 1 and has the telephone country code 1. Some North American countries, most notably Mexico, do not participate with the NANP.
Topics of features generally concern geography, history, nature, science, and world culture. The magazine is well known for its distinctive appearance: a thick square-bound glossy format with a yellow rectangular border.
nist.gov. The National Institute of Standards and Technology ( NIST) is an agency of the United States Department of Commerce whose mission is to promote American innovation and industrial competitiveness. NIST's activities are organized into physical science laboratory programs that include nanoscale science and technology, engineering ...
The city of Athens (Ancient Greek: Ἀθῆναι, Athênai [a.tʰɛ̂ː.nai̯]; Modern Greek: Αθήναι, Athine [a.ˈθi.ne̞] or, more commonly and in singular, Αθήνα, Athina [a.'θi.na]) during the classical period of ancient Greece (480–323 BC) was the major urban centre of the notable polis of the same name, located in Attica, Greece, leading the Delian League in the ...