In biology, pentamerism, also known as pentaradial symmetry, is a unique body symmetry exhibited primarily by starfish. It is rotational symmetry with respect to an angle of 72°, i.e. somewhat like radial symmetry, but less than that, with the body arranged around the axis of the mouth with five equal sectors. Main articles: Life All organisms (viruses not included) consist of cells, which in turn, are based on a common carbon-based biochemistry. ... Square with symmetry group D4 Symmetry is a characteristic of geometrical shapes, equations, and other objects; we say that such an object is symmetric with respect to a given operation if this operation, when applied to the object, does not appear to change it. ... NON TECHNICAL AND OF LOW INTELLIGENCE COMPUTER USER CALLING TECH SUPPORT. SEE S.E.C.S. ALSO This page is a candidate for speedy deletion. ... In physics and mathematics, rotational symmetry is the invariance of an object or a system of equations under a set of rotations - for example, rotational symmetry about an axis of rotation, or the SO(3) transformations of all possible rotations in three-dimensional space. ... In biology, radial symmetry is a property of some multicellular organisms. ...