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A realization of the Borromean rings by three mutually perpendicular golden rectangles can be found within a regular icosahedron by connecting three opposite pairs of its edges. [2] Every three unknotted polygons in Euclidean space may be combined, after a suitable scaling transformation, to form the Borromean rings.
The symbol is mostly formed with one or two wheels and one, two, or three wings—with one wheel and two wings being the most common form. The symbol was historically associated with the ancient Greek god Hermes and Roman god Mercury. In heraldry the symbol has been used to represent transport, speed and progress.
"current": AC (for "alternating current"); less commonly, DC (for "direct current"); or even I (the symbol used in physics and electronics) Roman numerals: for example the word "six" in the clue might be used to indicate the letters VI; The name of a chemical element may be used to signify its symbol; e.g., W for tungsten
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The center lens of the 2-circle figure is called a vesica piscis, from Euclid. Two circles are also called Villarceau circles as a plane intersection of a torus. The areas inside one circle and outside the other circle is called a lune. The 3-circle figure resembles a depiction of borromean rings and is used in 3-set theory Venn diagrams.
A crossword (or crossword puzzle) is a word game consisting of a grid of black and white squares, into which solvers enter words or phrases ("entries") crossing each other horizontally ("across") and vertically ("down") according to a set of clues. Each white square is typically filled with one letter, while the black squares are used to ...
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The term distinguishing mark was adopted by the 1924 International Convention Relative to Motor Traffic signed in Paris, which extended the maximum length of mark from two to three Latin letters, and permitted not just distinguishing marks for states, but also for non-sovereign territories which operated their own vehicle registration systems.