What symbols can be used upside down for Douyin screen names?

Douyin screen names can use various English symbols backwards. Heart symbols, chess symbols, scissors, airplanes, mobile phones, watches, hourglasses, envelopes, pens, pencils, copyrights, registered trademarks, service marks and trademark symbols, hearts, spades, squares and clubs in bloom symbols and other English symbols on Douyin Internet name regulations can be used backwards.

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