For some reason, this has been bothering me again. But at where I currently work, people have been tossing pentagram around where they should be using pentacle. They have very opposite semiotic qualities.
The above image is a pentacle and a pentagram. In occult sorcery this is traditionally linked with evil; it’s linked with Satanism, and negative emotions.
This is a form of pentacle (more similar to the Star of David and Israel), but it stated to be a a positive image, encouraging positive energy. In traditional European societies, it has been linked to feminine fertility imagery and ritual.
Both images are from wikipedia and are used here under CreativeCommons.