In geometry, the tesseract 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 six square faces, the hypersurface of the tesseract consists of eight cubical cells. The tesseract is one of the six convex regular 4-polytopes.

Tesseract (often stylized as TesseracT) is a British progressive metal band from Milton Keynes, England, formed in 2007. They are currently signed to Kscope. They are credited as one of the bands to pioneer the djent movement in progressive metal. As of September 2015, Tesseract have released three studio albums, One, Altered State, and Polaris, as well as a live album, "Odyssey/Scala", and the EPs Concealing Fate and Perspective. Their third studio album, Polaris, was released on September 18, 2015.