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Greek letters are used in mathematics, science, engineering, and other areas where mathematical notation is used as symbols for constants, special functions, and also conventionally for variables representing certain quantities.
In this map, the city points, highway lines, and the fill colors of the ocean and different countries are all considered map symbols. These symbols show location, convey information, increase aesthetic appeal, and create a gestalt order to the map.
In geometry, a diameter of a circle is any straight line segment that passes through the centre of the circle and whose endpoints lie on the circle. It can also be defined as the longest chord of the circle.
1838 map of railroad traffic in Ireland, one of the first thematic maps to use proportional symbols. Arthur H. Robinson credited Henry Drury Harness with the first map to clearly attempt to portray point sizes proportionally, on an 1838 map of cargo traffic in Ireland (with proportional widths) that showed city population.
Circled plus (⊕) or n-ary circled plus (⨁) (in Unicode, U+2295 ⊕ CIRCLED PLUS, U+2A01 ⨁ N-ARY CIRCLED PLUS OPERATOR) may refer to: . Sun cross, a circle containing four or more spokes with many variants and uses
Johannes Widmann (c. 1460 – after 1498) was a German mathematician.The + and - symbols first appeared in print in his book Mercantile Arithmetic or Behende und hüpsche Rechenung auff allen Kauffmanschafft published in Leipzig in 1489 in reference to surpluses and deficits in business problems.
The letter Sigma. Sigma (/ ˈ s ɪ ɡ m ə / SIG-mə; [1] uppercase Σ, lowercase σ, lowercase in word-final position ς; Ancient Greek: σίγμα) is the eighteenth letter of the Greek alphabet.
Ø (or minuscule: ø) is a letter used in the Danish, Norwegian, Faroese, and Southern Sámi languages. It is mostly used to represent the mid front rounded vowels, such as [] ⓘ and [] ⓘ, except for Southern Sámi where it is used as an [oe] diphthong.