Only Geniuses Can Solve This Annoyingly Hard Riddle

Word play has never been so difficult! Riddles are just so frustrating, but this test pushes that concept over the edge. You'll never be able to solve this riddle test, unless you're a genius that is...Try it!

Only Geniuses Can Solve This Annoyingly Hard Riddle Test

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I have one letter but my name is spelled with eight. What am I?