Also means
mystery, enigma
Usage Note
Incógnita is feminine despite ending in -a following normal gender patterns. In mathematics it is the standard word for an 'unknown' in an equation (the x). Outside maths it describes any unanswered question or unsolved mystery — la gran incógnita ('the big unknown') is a very common journalistic phrase.
Examples
"El futuro sigue siendo una incógnita."
Natural Translation
The future remains an unknown.

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