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A pair of overdots placed over a symbol, as in x^.., most commonly used to denote a second derivative with respect to time, i.e., x^..=d^2x/dt^2.

A dual bivector is defined by X^~_(ab)=1/2epsilon_(abcd)X^(cd), and a self-dual bivector by X_(ab)^*=X_(ab)+iX^~_(ab).

Can be used to invert a Laplace transform.

Not concentric.

A positive-height (outward-pointing) pyramid used in augmentation. The term was introduced by B. Grünbaum.

A space endowed with a non-Euclidean elliptic geometry.

Johnson solid J_(20).

Johnson solid J_(40).

Johnson solid J_(18).

Johnson solid J_7.