I know this is going to sound crazy, but just hear me out.
Has anyone noticed the symbols on the robed PS enemies (xe-a-thouls, fiends, etc.)? It seems to be pretty similar, even across the different games. I'm sorry I don't have a good picture of it, but you can kind of make it out on these game sprites from PSII:
http://www.pscave.com/ps2/enemies/wizard.shtml
Now take a look at the kabbalastic symbol for Algol:
http://en.wikipedia.org/wiki/File:Algol ... 531%29.svg
If you rotate the Algol symbol 90 degrees clockwise, doesn't it look a lot like the symbol on the front of the fiends' robes?
Of note: Algol is a behenian star, and during the middle ages it was said to have magical properties. One could draw the star's power through certain rituals, etc. Here's the wiki entry:
http://en.wikipedia.org/wiki/Behenian_fixed_stars
The fiends and thouls/lars/etc. from PS are the strongest non-boss enemy (aside from Prophallus). They have some scary magical abilities, too. What if their symbol is a way to draw magical powers from Algol?