The pentagram has many correspondences. As people have noted thr most commonis the five elements of Earth, Air, Water, Fire and Spirit. It could represent the Pentagrammaton, or the five lettered nome of God (Yeshuah, or Jesus). It has been called the sign of Man. It typically represents energies close to the physical lever or astral level. The LBRP clears and banishes on the physical and astral levels, while the BRH is for the spiritual levels.
More advanced correspondences include the spheres of thr Tree of Life, archangels, godforms, etc. Of course, these are drawn from Ceremonial Magic. The pentagram is a symbol that has existed in practically every culture. Because of this some correspondences may differ. It can be used for protection as well as for summoning.
Personally, for me the pentagram is life. It is the interplay of energies that make up everything and it includes spirit. Much more powerful symbol than the cross which only represents the four elements. It has a creative and destructive paths. I apply these psychologically when working with hypnosis clients.
As always, just my humble opinion.