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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 ).
Size of this PNG preview of this SVG file: 750 × 350 pixels. Other resolutions: 320 × 149 pixels | 640 × 299 pixels ... double-arrow blue and red Licensing.
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:
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
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 .
The "faux seal" showed a double-headed eagle, in the tradition of the Russian state (suggestive of Russian interference in U.S. politics). In one claw the arrows had been replaced with golf clubs (representing the president's connection to the sport), while the other held a wad of green banknotes.
Armiger: Russian Federation: Adopted: 30 November 1993 (current version) Shield: Gules, a double-headed eagle displayed, twice imperially crowned, grasping in the dexter claw an imperial sceptre, and in the sinister claw an imperial orb, all Or; in chief another larger imperial crown with issuant and pendent therefrom a ribbon, also Or; the eagle is charged on the breast with an escutcheon ...
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;