What is the difference in the pentagram and Jewish symbol?

A pentacle is a five-pointed upright star with a circle around it, whereas the pentagram is a five-pointed upright star without the circle.

From an occult perspective, pentacles are representative of "white" magic and "good." It also represents man's intellect and reason. Often times pentacles are used as talisman-inanimate objects laced with psychic powers. Pentacles also represent the "feminine element Earth." Following this "Earth" line of thinking, one particular advocate of witchcraft equated the up-right star with the "ability of bringing Spirit to Earth," stating that it is "what makes us whole."

On Pentagrams; Eliphas Levi, one of the most influential magicians of the 1800's, wrote in his massive volume on transcendental magic,

"The Pentagram signifies the domination of the mind over the elements, and the demons of air, the spirits of fire, the phantoms of water and ghosts of earth are enchained by this sign. Equipped therewith, and suitably disposed, you may behold the infinite through the medium of that faculty which is like the soul's eye, and you will be ministered unto by legions of angels and hosts of fiends."

He is right.