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A mathematical symbol is a figure or a combination of figures that is used to represent a mathematical object, an action on mathematical objects, a relation between mathematical objects, or for structuring the other symbols that occur in a formula.
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.
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.
The nabla is a triangular symbol resembling an inverted Greek delta: [1] or ∇. The name comes, by reason of the symbol's shape, from the Hellenistic Greek word νάβλα for a Phoenician harp, [2] [3] and was suggested by the encyclopedist William Robertson Smith in an 1870 letter to Peter Guthrie Tait.
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
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.
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.