Double-ended Ketch
Double ended or double-ended may refer to: * Double-ended ferry, see Ferry#Double-ended * Double-ended queue * Double-ended priority queue * Double-ended tram * Double-ended playing cards * Double-ended pipefish * Double ended stern The stern is the back or aft-most part of a ship or boat, technically defined as the area built up over the sternpost, extending upwards from the counter rail to the taffrail. The stern lies opposite the bow, the foremost part of a ship. Or ...

Ferry
A ferry is a ship, watercraft or amphibious vehicle used to carry passengers, and sometimes vehicles and cargo, across a body of water. A passenger ferry with many stops, such as in Venice, Italy, is sometimes called a water bus or water taxi. Ferries form a part of the public transport systems of many waterside cities and islands, allowing direct transit between points at a capital cost much lower than bridges or tunnels. Ship connections of much larger distances (such as over long distances in water bodies like the Mediterranean Sea) may also be called ferry services, and many carry vehicles. History In ancient times The profession of the ferryman is embodied in Greek mythology in Charon, the boatman who transported souls across the River Styx to the Underworld. Speculation that a pair of oxen propelled a ship having a water wheel can be found in 4th century Roman literature "''Anonymus De Rebus Bellicis''". Though impractical, there is no reason why it could not work ...
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Double-ended Queue
In computer science, a double-ended queue (abbreviated to deque, pronounced ''deck'', like "cheque") is an abstract data type that generalizes a queue, for which elements can be added to or removed from either the front (head) or back (tail). It is also often called a head-tail linked list, though properly this refers to a specific data structure ''implementation'' of a deque (see below). Naming conventions ''Deque'' is sometimes written ''dequeue'', but this use is generally deprecated in technical literature or technical writing because ''dequeue'' is also a verb meaning "to remove from a queue". Nevertheless, several libraries and some writers, such as Aho, Hopcroft, and Ullman in their textbook ''Data Structures and Algorithms'', spell it ''dequeue''. John Mitchell, author of ''Concepts in Programming Languages,'' also uses this terminology. Distinctions and sub-types This differs from the queue abstract data type or ''first in first out'' list ( FIFO), where elements c ...
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Double-ended Priority Queue
In computer science, a double-ended priority queue (DEPQ)Data Structures, Algorithms, & Applications in Java: Double-Ended Priority Queues

Sartaj Sahni

, 1999. or double-ended heap is a data structure similar to a priority queue or heap, but allows for efficient removal of both the maximum and minimum, according to some ordering on ...
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Double-ended Tram
A tram (called a streetcar or trolley in North America) is a rail vehicle that travels on tramway tracks on public urban streets; some include segments on segregated Right-of-way (transportation), right-of-way. The tramlines or networks operated as public transport are called tramways or simply trams/streetcars. Many recently built tramways use the contemporary term light rail. The vehicles are called streetcars or trolleys (not to be confused with trolleybus) in North America and trams or tramcars elsewhere. The first two terms are often used interchangeably in the United States, with ''trolley'' being the preferred term in the eastern US and ''streetcar'' in the western US. ''Streetcar'' or ''tramway'' are preferred in Canada. In parts of the United States, internally powered buses made to resemble a streetcar are often referred to as "trolleys". To avoid further confusion with trolley buses, the American Public Transportation Association (APTA) refers to them as "trolley- ...
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Double-ended Playing Card
The following is a glossary of terms used in card games. Besides the terms listed here, there are thousands of common and uncommon slang terms. Terms in this glossary should not be game-specific (e.g. specific to Bridge, Hearts, Poker or Rummy), but apply to a wide range of card games. For glossaries that relate primarily to one game or family of similar games, see Game-specific glossaries. A ; Ace # The card with one pip in a pack of cards. Usually the highest card of a suit, ranking immediately above the King. May also occupy the lowest rank. # Commonly refers to the Deuce or Two in German-suited packs which don't have real Aces. Often the highest card of a suit. ; Acorns : One of the four suits in a German-suited pack of cards. Symbol: ; active # A card that is in play i.e. not sleeping. # See active player. ; active player # A player who receives cards in the current deal (i.e. is not sitting out because there are more players than the game is desig ...
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Double-ended Pipefish
The alligator pipefish or double-ended pipefish (''Syngnathoides biaculeatus'') is a species of fish in the family Syngnathidae and is the only species in the monotypic genus ''Syngnathoides''. It is found in shallow water in the tropical and subtropical Indo-Pacific, its range extending from East Africa to northern Australia. This fish lives in habitats of seagrass and seaweed, and hides by positioning itself vertically with its head down amidst the similar-coloured fronds of vegetation. The elongated, well-camouflaged body can reach in length. It feeds by sucking up its prey. Description The alligator pipefish can grow to a length of about though a more typical length is . The narrow head has the snout tipped by a pair of short tentacles and the body is elongated and tetrahedral. The dorsal fin has 38 to 48 soft rays and the anal fins have 4 soft rays. The tail is long and tapering. It is prehensile and lacks a tail fin, being used to anchor the fish to vegetation. The co ...
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