I suggest you completely ignore theta sigma it is nonsense.
If I recomember correctfully, the character who revealed this name pronounced it "fee'a", and it was only after a chat with a DWAS member at school that I knew that it was supposed to be "theta".
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If I recomember correctfully, the character who revealed this name pronounced it "fee'a", and it was only after a chat with a DWAS member at school that I knew that it was supposed to be "theta".