Also, the keywords can be interpreted and can be analyzed as "Yod, Aleph, Ayin". This has some pretty deep roots that can be qabalistically traced to a plethora of useful and powerful stuff.
And as Jim said, one can use the qabbalistic cross instead.
Though Osiris Risen is still acceptable nowadays for the pentagram, and can be interpreted as Ayin, or Pan, as the inverted pentagram for the New Aeon. (Seeing as how Osiris is under the Earth growing horns 'n all.)
😄