*History Lesson: The earliest use of the pentagram dates back to 3500 BC. The Chaldees of Mesopotamia inscribed the symbol on their pottery and other artifacts. The Hebrews used the pentagram as a symbol of truth and to represent the Pentateuch, the first five books of the Hebrew Scriptures. The Pythagoreans of ancient Greece were fascinated by the mathematical purity of the symbol and viewed it as a sign of perfection. Ancient Babylonians used the pentagram to represent the gods and religious beliefs of their culture. During the medieval era, Christians believed that the pentagram symbolized the five wounds of Christ and it was used to ward off evil spirits. For the first few hundred years after Christ’s death, the pentagram was the primary symbol of the Catholic Church,(although many christian religions today do not know this).
TODAY: A number of groups still use the pentagram as a symbol of harmony and spirituality. The symbol of the pentagram is also used in many Wiccan ceremonies. Wiccans see the star as symbolizing the four elements of air, water, earth and fire, which are perfectly balanced to create the fifth element of spirit. The pentagram has long been a spiritual symbol. Despite any negative stigmas that may be attributed to the five-pointed star, it remains a beacon for those seeking spiritual clarity and divine knowledge.
The pentacle meaning can be seen as many different things, but no matter what that is, or what faith it is, one commonality is that the pentacle is a symbol that represents Earth, Air, Fire, Water at each of its five points and the Spirit as the center.
*taken from original botanica - I find this is the best, right to the point meaning in history of the pentagram.