I don't think sign writing is the best analogy. Fairy chess starts with the basic set of six chess symbols, like a lot of linguists start with the 26 basic Latin characters. Likewise, because fairy chess has a smaller printing budget then even linguistics, instead of creating new characters, old ones are rotated and flipped. It's not systematic from what I've seen; a pawn rotated left means that we have a pawn like piece and we've already used the pawn flipped. A fairy symbol would be awesome, but that would take hiring some capable of drawing an abstract fairy consistent with the rest of the notation. So they rotate and turn even when it's not helping clarity.
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