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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 ).
A two-headed Orthrus and a three-bodied Geryon. Attic black-figure neck amphora, by the Swing Painter, c. 550–500 BC (Paris, Cab. Med. 223). Depictions of Orthrus in art are rare, and always in connection with the theft of Geryon's cattle by Heracles. He is usually shown dead or dying, sometimes pierced by one or more arrows. [10]
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 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 ...
Broad arrow or W engines have three groups, one vertical and the two others symmetrically angled at less than 90° on either side. Both the air-cooled Anzani 3-cylinder fan engines of the "pioneer era" of aviation , and the later, " Golden Age of Aviation "-era British Napier Lion 12-cylinder, triple-bank liquid-cooled inline aviation engine ...
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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 ...
Gules, a two-towered castle portcullised Argent, with an escutcheon of Or, a double-headed eagle sable at the honour point. Welzheim. Argent, a pine tree on a mount Vert. County of Wertheim. Party per fess: Or, a demi-eagle displayed Sable, langued and beaked Gules; and Azure three roses Argent. Wiesentheid