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i find it funny that the unown letters are often compared to hieroglyphs when they are much more similar to runes
but anyway the fact that each unown letter has a corresponding english verb associated with it (via the Unown Report) screams “rune” to me
the name of 
is 
for example
my understanding as someone who cannot read japanese is that this is a translation error, and the original pokédex entry just calls them “ancient characters” and not hieroglyphs specifically