
1) Fourth-dimensional model 2) Free software programmed in C
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https://www.crosswordclues.com/clue/tesseract

In geometry, the tesseract, also called an 8-cell or regular octachoron or cubic prism, is the four-dimensional analog of the cube; the tesseract is to the cube as the cube is to the square. Just as the surface of the cube consists of 6 square faces, the hypersurface of the tesseract consists of 8 cubical cells. The tesseract is one of the six con...
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http://en.wikipedia.org/wiki/Tesseract
[software] Tesseract is an optical character recognition engine for various operating systems. It is free software, released under the Apache License, Version 2.0, and development has been sponsored by Google since 2006. Tesseract is considered one of the most accurate open source OCR engines currently available. == History == The Tesseract...
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http://en.wikipedia.org/wiki/Tesseract_(software)

figure of a cube within a cube
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http://phrontistery.info/t.html

The four-dimensional analogue of a cube, also known as a 4-space hypercube or an 8-cell. The name, possibly coined by Charles Hinton, comes from tesser, meaning four, and aktis, meaning ray, thus 'four rays.' Just as a cube is obtained by 'thickening' a square in the third dimension, which can be ...
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http://www.daviddarling.info/encyclopedia/T/tesseract.html

tesseract, tesseractic A four-dimensional hypercube.
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http://www.wordinfo.info/words/index/info/view_unit/2667/
No exact match found.