Read every third letter, then decode.

˙pɥxuɐɥpqǝxɥɯɹɥsq oɥpɯʇظpu pʞsuɹɥpɯɐʍɹɐɥʎpq sʇpqıbpqɥpʇbʇʎɟq

(the upside down text makes it harder. Don't ask what this means-> I can't write after it->ظ

Oh wait, I just had to shake it in source. Wikipedia seems to know what it is : ظ Wictionary)

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