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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.
Contents. hide. (Top) Class 000 – Computer science, information, and general works. Class 100 – Philosophy and psychology. Class 200 – Religion. Class 300 – Social sciences. Class 400 – Language. Class 500 – Science.
Pennsylvania ( / ˌpɛnsɪlˈveɪniə / ⓘ, lit. 'Penn's forest country' ), officially the Commonwealth of Pennsylvania [b] ( Pennsylvania Dutch: Pennsylvanie ), [7] is a state spanning the Mid-Atlantic, Northeastern, Appalachian, and Great Lakes regions of the United States.
Geologic time scale. The geologic time scale, proportionally represented as a log-spiral with some major events in Earth's history. A megaannus (Ma) represents one million (10 6) years. The geologic time scale or geological time scale ( GTS) is a representation of time based on the rock record of Earth. It is a system of chronological dating ...
A peak or projection from the top of a hill or mountain, or any rounded protrusion of land, especially a small but prominent or isolated hill with steep sides; a boulder or an area of resistant rock protruding from the side of a hill or mountain. The term is used primarily in the southern United States. [5] knoll.
Several other prefixes, including 800-484, 800-703, 800-744, and 800-904 are reserved by the FCC. NPA-911 is forbidden as 9-1-1 is an emergency telephone number . (This is less restrictive than the rules prohibiting all three-digit N-1-1 codes as exchanges in all geographic area codes.)
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).
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 ...
800 — 810: 811: 812 — 819: 820 — 899 900 — 910: 911: 912 — 919: 920 — 999 152 area codes 8 special service codes: 640 CO codes
Geographic number. 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 ...