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Alone I’m Unknown

Alone I’m unknown,
With my twin I’m twenty,
And triplets make me a warning.

What am I?

The letter ‘X’. A single x is often used in math as an unknown, along with Mr. X. Two together (XX) make the Roman numeral 20, and three signifies a warning for adult only content, or a warning to other programmers of a problem in source code.


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1 Comment on "Alone I’m Unknown"


Joy Rule says
September 21, 2018 @ 18:28

Would love some Christmas riddles for the Xmas club now in the planning stages.

Enjoy the site very much.
Thanks Joy


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