It was meant to symbolize the capstone , the top of the pyramid. the first letter of the alphabet is meant to make you remember who is in charge. At least in linguistic theory , (or my personal theory anyways)
patriatchy of the pyramid rules , to a certain extent . etc. etc.
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The "capital" A (the one that is used for important words) is the one that also resembles the traditional triangle which in relation to jewish lore coincides with the male principle ... i.e. the penis (whereas the reverse is the vagina...nice!)
hence perpetuating the patriarchal rule up until this point (no im just joking)
the lower case "a" obviously encourages the inferiority of something smaller like a female, it perpetuates our hegemonic masculine society , because you were not intelligent enough to not know that you were just told what to do.
duh?
I am reading Rick RiordanThe Red Pyramid and what you say makes sense.