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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 ).
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 .
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 ...
The Imperial Standard was the black Double-Headed Eagle displayed on a golden banner, which represented the Empire and the Emperor, the absolute ruler of Russia. [4] When the black-yellow-white flag was in use between 1858 and 1896, the white-blue-red flag was still used as a merchant ensign. [4] 1721–1896: Civil ensign of the Russian Empire ...
White Heart “This emoji is best to use along with other black and white emojis or any emojis that give off ~angel~ energy (i.e. ☁️🐚🕊🦢),” says Naydeline Mejia, an assistant editor ...
The double-headed eagle was used in the breakaway Empire of Trebizond as well. Western portolans of the 14th–15th centuries use the double-headed eagle (silver/golden on red/vermilion) as the symbol of Trebizond rather than Constantinople. Single-headed eagles are also attested in Trapezuntine coins, and a 1421 source depicts the Trapezuntine ...
The broad arrow was used by the British to mark trees (one species of which was the eastern white pine) intended for ship building use in North America during colonial times. Three axe strikes, resembling an arrowhead and shaft, were marked on large mast -grade trees. [ 26 ]
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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