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The double-headed arrow representing logical equivalence was introduced by Albrecht Becker in Die Aristotelische Theorie der Möglichkeitsschlüsse, Berlin, 1933. [ 4 ] Knuth's up-arrow notation uses multiple up arrows, such as ⇈, for iterated, or repeated, exponentiation ( tetration ).
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This was the first time the Russian Orthodox Cross was used on church domes. During 1577–1625, the Russian Orthodox cross was depicted between the heads of a double-headed eagle in the coat of arms of Russia. It was drawn on military banners until the end of the 17th century. [34]
Size of this PNG preview of this SVG file: 200 × 200 pixels. ... English: orange double-ended arrow pointing left & right, yellow circle background. Date: 14 July 2009:
An early depiction of a double-headed Imperial Eagle in a heraldic shield, attributed to Frederick II of Hohenstaufen, is found in the Chronica Majora by Matthew Paris (circa 1250). Segar's Roll (circa 1280) likewise depicts the double-headed Imperial Eagle as the coat of arms of the King of Germany .
Moore, Lisa (2014-11-10), "Consensus 141-C2", UTC #141 Minutes, Create formal aliases of type "correction" for Unicode 8.0 for 2B7A LEFTWARDS TRIANGLE-HEADED ARROW WITH DOUBLE HORIZONTAL STROKE and 2B7C RIGHTWARDS TRIANGLE-HEADED ARROW WITH DOUBLE HORIZONTAL STROKE: N4739 "M64.06", Unconfirmed minutes of WG 2 meeting 64, 2016-08-31
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Double Arrow or Double arrow may refer to: a subset of arrows in Unicode; the British Rail Double Arrow logo, now officially known as the National Rail Double Arrow;