three-dimensional unit

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• Unit sphere — some unit spheres In mathematics, a unit sphere is the set of points of distance 1 from a fixed central point, where a generalized concept of distance may be used; a closed unit ball is the set of points of distance less than or equal to 1 from a …   Wikipedia

• Unit cube — A unit cube is a cube all of whose sides are 1 unit long. The volume of a 3 dimensional unit cube is 1 cubic unit, and its total surface area is 6 square units. Unit Hypercube The term unit cube or unit hypercube is also used to refer to… …   Wikipedia

• Unit vector — In mathematics, a unit vector in a normed vector space is a vector (often a spatial vector) whose length is 1 (the unit length). A unit vector is often denoted by a lowercase letter with a hat , like this: (pronounced i hat ). In Euclidean space …   Wikipedia

• Dimensional analysis — In physics and all science, dimensional analysis is a tool to find or check relations among physical quantities by using their dimensions. The dimension of a physical quantity is the combination of the basic physical dimensions (usually mass,… …   Wikipedia

• Dimensional lumber — Dimension Di*men sion, n. [L. dimensio, fr. dimensus, p. p. of dimetiri to measure out; di = dis + metiri to measure: cf. F. dimension. See {Measure}.] 1. Measure in a single line, as length, breadth, height, thickness, or circumference;… …   The Collaborative International Dictionary of English

• Three Sisters (Pittsburgh) — Infobox Bridge bridge name=The Three Sisters caption=View of Sixth, Seventh and Ninth Street Bridges from downriver carries=2 Vehicular lanes, 2 sidewalks crosses=Allegheny River locale=Pittsburgh, Pennsylvania maint=Allegheny County design=Self… …   Wikipedia

• Rigid Unit Modes — (RUMs) represent a class of lattice vibrations or phonons that exist in network materials such as quartz, cristobalite or zirconium tungstate. Network materials can be described as three dimensional networks of polyhedral groups of atoms such as… …   Wikipedia

• No-three-in-line problem — A set of 20 points in a 10 × 10 grid, with no three points in a line. In mathematics, in the area of discrete geometry, the no three in line problem, introduced by Henry Dudeney in 1917, asks for the maximum number of points that can be placed in …   Wikipedia

• Hounsfield unit — (HU)    a unit used in medical imaging (CT or MRI scanning) to describe the amount of x ray attenuation of each voxel (volume element) in the three dimensional image. The voxels are normally represented as 12 bit binary numbers, and therefore… …   Dictionary of units of measurement

• List of UNIT personnel — UNIT stands for UNified Intelligence Taskforce, (formerly it stood for United Nations Intelligence Taskforce), a fictional entity in the Doctor Who universe. UNIT first appeared in the Second Doctor serial The Invasion, (1968), although Alistair… …   Wikipedia

• List of UNIT personnel in Doctor Who — UNIT stands for Unified Intelligence Taskforce, (formerly it stood for United Nations Intelligence Taskforce), a fictional entity in the Doctor Who universe.UNIT first appeared in the Second Doctor serial The Invasion , (1968), although Alistair… …   Wikipedia