A pentagram (sometimes known as pentalpha or pentangle) is the shape of a five-pointed star drawn with five straight strokes.

Pentagrams were used symbolically in ancient Greece and Babylonia. The Pentagram has magical associations, and many people who practice neopagan faiths wear jewelry incorporating the symbol. Christians once more commonly used the pentagram to represent the five wounds of Jesus, and it also has associations within Freemasonry.

In the Decahedron and Pentagonal Star the pentagram emerges into a 10-faced 3-dimensional polyhedron - a decahedron, which shares the pentagram's self-generating divine proportions.

The pentagram has long been associated with the planet Venus, and the worship of the goddess Venus, or her equivalent. It is also associated with Venus as the Morning Star, the bringer of light and knowledge. It is most likely to have originated from the observations of prehistoric astronomers, for when viewed from Earth, successive inferior conjunctions of Venus plot a nearly perfect pentagram shape around the zodiac every eight years.