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A circle with an arrow indicating a direction.

Two lines that lie on top of one another are called coincident lines.

A cupola adjoined to a rotunda.

K=(dT)/(ds), where T is the tangent vector defined by T=((dx)/(ds))/(|(dx)/(ds)|).

The star polygon {10/3}.

Johnson solid J_(90).

The star polygon {12/5}.

The product of three translations along the directed sides of a triangle through twice the lengths of these sides is the identity map.

Not concentric.

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