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%ما هو (من)٪ 1 - تعريف

NOTATION THAT DEFINES REGULAR POLYTOPES AND TESSELLATIONS
Schlafli symbol; Schlaefli symbol; Extended Schlafli symbol; Extended Schläfli symbol
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Symbol (typeface)         
TYPEFACE FOR GREEK AND MATHEMATICAL SYMBOLS
Symbol font; Symbol (font); Symbol.ttf; MS Symbol; Radicalex; Radical extender; Ventura Symbol; Mac OS Symbol; Code page 1038; X-mac-symbol
Symbol is one of the four standard fonts available on all PostScript-based printers, starting with Apple's original LaserWriter (1985). It contains a complete unaccented Greek alphabet (upper and lower case) and a selection of commonly used mathematical symbols.
Extinction symbol         
  • Flag with the extinction symbol
  • [[Extinction Rebellion]], London (2019)
SYMBOL REPRESENTING THREAT OF MASS EXTINCTION
Extinction Symbol
The extinction symbol represents the threat of holocene extinction on Earth; a circle represents the planet and a stylised hourglass is a warning that time is running out for many species. The symbol dates to at least 2012 and has been attributed to anonymous East London artist Goldfrog ESP.
Chemical symbol         
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  • Annotated example of an atomic symbol
  • Dalton's symbols for the more common elements, as of 1806, and the relative weights he calculated. The symbols for magnesium and calcium ("lime") were replaced by 1808, and that for gold was simplified.
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ARBITRARY OR CONVENTIONAL SIGN USED IN CHEMISTRY TO REPRESENT AN ELEMENT (OR SOMETIMES A FUNCTIONAL GROUP OR A CLASS OF ELEMENTS)
Symbol (chemistry); Symbol for the chemical element; Chemical symbols; Atomsymbol; Element Symbol; Element symbols; Element symbol; Atomic symbol; List of elements by symbol; Symbol (chemical element); Daltonian symbol; Atomic symbols
Chemical symbols are the abbreviations used in chemistry for chemical elements, functional groups and chemical compounds. Element symbols for chemical elements normally consist of one or two letters from the Latin alphabet and are written with the first letter capitalised.

ويكيبيديا

Schläfli symbol

In geometry, the Schläfli symbol is a notation of the form { p , q , r , . . . } {\displaystyle \{p,q,r,...\}} that defines regular polytopes and tessellations.

The Schläfli symbol is named after the 19th-century Swiss mathematician Ludwig Schläfli,: 143  who generalized Euclidean geometry to more than three dimensions and discovered all their convex regular polytopes, including the six that occur in four dimensions.