Can I wear a T-shirt with a 5 sided pentagram on it? It's usually associated with Wiccans/Satan so it's seems like there might be some kind of issur here, though I can't think of one.
A comparable Shaila is if one can wear a shirt with a cross on it, if the cross was not printed "Leshem Avodah Zarah". See here, here, here, here and here, which are Matir this according to the technical Halacha, but suggest that it is inappropriate. Therefore, this is Halachically appropriate to wear in terms of Hilchos Avodah Zarah according to the Poskim quoted above.