In this case, we can assume the star is the 5-pointed star known as a pentacle. Pentacles are frequently used in magic rituals. If the "legs" point downward it has a number of positive meanings. But if the legs of the pentacle point upwards it is the sign of the "goat", i.e. Satan. I think that is the type of pentacle described here.
But then again, just walking through a large mall around here leads me to believe a 14 year-old with a stud in her bottom lip and another one perched on the side of her nose......and gothic-black eye-makeup laid on her sullen face with a trowel would definitely know what a pentacle is!
Leni