polygonal hole

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• Polygonal modeling — In 3D computer graphics, polygonal modeling is an approach for modeling objects by representing or approximating their surfaces using polygons. Polygonal modeling is well suited to scanline rendering and is therefore the method of choice for real …   Wikipedia

• Murder-hole — Meurtrière redirects here. For the 2006 French film, see Meurtrières. Murder holes at Bodiam Castle A murder hole or meurtrière is a hole in the ceiling of a gateway or passageway in a fortification through which the defenders could fire, throw… …   Wikipedia

• holyhedron — noun A polyhedron with a finite number of faces and with a polygonal hole in every face, the holes boundaries sharing no point with each other or the faces boundary. John Conway of Princeton University offered a reward in the 1990s to anyone… …   Wiktionary

• keyboard instrument — ▪ music Introduction       any musical instrument on which different notes can be sounded by pressing a series of keys, push buttons, or parallel levers. In nearly all cases in Western music the keys correspond to consecutive notes in the… …   Universalium

• Internal ballistics — Internal ballistics, a subfield of ballistics, is the study of a projectile s behavior from the time its propellant s igniter is initiated until it exits the gun barrel. The study of internal ballistics is important to designers and users of… …   Wikipedia

• number game — Introduction       any of various puzzles and games that involve aspects of mathematics.       Mathematical recreations comprise puzzles and games that vary from naive amusements to sophisticated problems, some of which have never been solved.… …   Universalium

• Heckler & Koch HK41 — Infobox Weapon name=Heckler Koch 41 caption=HK 41 rifle with mounted scope origin=flagcountry|Germany type=Sporting and Target Rifle is ranged=yes service= used by= wars= designer= design date= manufacturer=Heckler Koch production date=1964 1976… …   Wikipedia

• Castle — This article is about medieval fortifications. For other uses, see Castle (disambiguation). For a list of all castles, see List of castles. For similar but unrelated structures in Japan, see Japanese castle …   Wikipedia

• military technology — Introduction       range of weapons, equipment, structures, and vehicles used specifically for the purpose of fighting. It includes the knowledge required to construct such technology, to employ it in combat, and to repair and replenish it.… …   Universalium

• Keep — For other uses, see Keep (disambiguation). Donjon redirects here. For the role playing game of the same name, see Donjon (role playing game) …   Wikipedia

• arctic — arctically, adv. /ahrk tik/ or, esp. for 7, /ahr tik/, adj. 1. (often cap.) of, pertaining to, or located at or near the North Pole: the arctic region. 2. coming from the North Pole or the arctic region: an arctic wind. 3. characteristic of the… …   Universalium