You are correct that the star isn't a pentagram. However, it isn't a pentacle, or Star of Solomon, either. Pentacle is usually a pagan term that refers to either an altar piece or a piece of jewelry worn by them. Doesn't matter whether it's inverted or upright. Reversed also doesn't necessarily mean satanism. Some Wiccans use the inverted pentacle to show a particular degree of initiation. If you think satanism and Wicca are the same thing, do a bit of research... in fact, Anton LeVey based his Church of Satan on objectivism.
The key identifying factor of a pentagram/pentacle is that it is formed by five criss-crossing lines/bars. As you can see, these don't exist in the Rush star. It's simply a 5-pointed star.
May give some insight, although it also could have been gleaned from a literary source, as mentioned by a previous poster:
http://medical-dicti...nary.com/syrinx
@GoKartMozart. 'T'isn't Latin, it's Greek.