Pentagrams are often thought to be associated with cults and satanic rituals. However, they have a very Christian background. Christians used to use this symbol (without the circle) to represent the five wounds of Christ at the cross. It is also a Christian symbol of the five senses and medieval Christians thought it to be a sign that protected against evil and demons. Another Christian interpretation of the symbol was the five joys that Mary had with Jesus.
It is also heavily associated with the stories of King Arthur. The sign can also symbolize the five virtues that Sir Gawain hoped to achieve.
It is important to address, however, which points of the star are pointed upwards and how many there are. Only if there are two points pointing upward, the head of a goat is inside the pentagram, and a circle encases it is it the satanic symbol that people interpret it as.
However, if it is only a single point upward and a circle encases it, it represents the feminine spirit or force and represents the four elements and the spirit. The circle binds the five points together to create life.