I am part of a duo, yet I always stand alone. I can signify much but often goes unnoticed. What am I?

Category: Wordplay · Difficulty: hard

Hint: Consider something essential in mathematics.

Answer

A solitary number

Explanation

A solitary number stands independently yet is part of numerical systems, unlike the other options which represent concepts of togetherness or transience.

This is a hard wordplay riddle — a tricky one that takes a little thought. The answer is A solitary number.

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