A geoboard is a mathematical manipulative used to explore basic concepts in plane geometry such as perimeter, area and the characteristics of triangles and other polygons. It consists of a physical board with a certain number of nails half driven in, around which are wrapped rubber bands. Geoboards were invented and popularized in the 1950s by Egy...
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http://en.wikipedia.org/wiki/Geoboard
A device commonly used in elementary schools to aid in the teaching of basic geometric concepts. A simple geoboard can be made from a square piece of wood and 25 nails arranged in an evenly-spaced grid of 5 vertical lines and 5 horizontal lines. These nails represent the lattice points in the plane....
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http://www.daviddarling.info/encyclopedia/G/geoboard.html
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