Unfortunately, you can then easily run into the problems of other religion-specific clothing, hairstyles, etc. What if the schools decided that all yarmulkes for Jewish boys were out? Or headdresses/veils for muslim girls? Or that boys were not allowed to have long hair–even Sikhs and Rastafarians?
The schools should just grow up, take a deep breath, and patiently explain to everyone that THEY HAVE NO AUTHORITY over such matters. Just as they have no authority over what type of car the students’ parents drive, or whether the kids prefer Pokemon or Dragonball Z. It just isn’t seomething they need or want to get involved in. Concentrate, instead, on engaging kids interest in reading, math, and science.
Pentacles are numerically symbolic of regeneration; an inversion of which eludes to degeneration. Anyone with half a brain these days knows that there is no frame of reference from which pentacles are inverted; so in all honesty, the pentacle is a symbol of regeneration/degeneration, the duality, no matter which way it faces. Enclosed in a circle eludes to the process, pure, unadulterated; equal, democratic - of sustainence, regeneration, recording etc…
That is the pythagorean (and older) numerical value of 5, in number symbolism.
In this sense, it symbolizes the process of permanence. It is not memory or form; but rather symbolic of the displacement of form, and the universal embeddedness of remembering, and seeking to re-become that form. It is also symbolic of replication.