Definition:Pentagram

Definition
A pentagram is a geometric figure formed by the line segments connecting alternate vertices of a regular pentagon:


 * Pentagram.png

Also known as
In certain non-mathematical contexts, the word pentacle is frequently seen for pentagram.

The word pentalpha is a $17$th century revival of another ancient Greek name for this shape, deriving from a construction from five overlapping $\Alpha$ (greek Alpha) symbols.