origami wiki:
ami (æãç´ or æç´ origami "paper folding") is the art of Japanese paper folding. The word literally means "paper folding" in Japanese and refers to all types of paper folding, even those of non-Japanese origin.Origami only uses a small number of different folds, but they can be combined in a variety of ways to make intricate designs. In general, these designs begin with a square sheet of paper, whose sides may be different colors, and proceed without cutting the paper. Contrary to most popular belief, traditional Japanese origami, which has been practiced since the Edo era (1603-1867), has often been less strict about these conventions, sometimes cutting the paper during the creation of the design (Kirigami åãç´) or starting with a rectangular, circular, or other non-square sheets of paper.
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Number wiki:
>This article is about the concept used to describe and assess quantity. For other uses of the term, see Number (disambiguation). A number is an abstract entity used originally to describe quantity. At least since the invention of complex numbers, this definition must be relaxed.
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arrow wiki:
>For other uses, see Arrow (disambiguation). An arrow is a pointed projectile that is shot with a bow. It predates recorded history and is common to most cultures. An arrow consists of a long and thin shaft made formerly of wood and now also from aluminium or carbon fiber composite. It is pointed or armed with an arrowhead at one end and with a nock or notch in the other. Arrowheads fit hunting and military purpose better than a mere point, which is mostly useful for target-shooting. Near the notch end are vanes which keep the arrow pointed in the direction of travel. There are often three vanes but many fletchings have four or even more. They were originally made from feathers but are now often made of plastic.
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