Is there a word that means 'an unknown phenomenon or concept'? Is it really referred whit the one letter word 'X'?
closed as not constructive by Matt E. Эллен♦, FumbleFingers, cornbread ninja 麵包忍者, Mitch, MrHen Apr 5 '12 at 4:59
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Maybe you mean an unknown, the definition being:
- an unknown person, quantity, or thing
- (Mathematics) a variable, or the quantity it represents, the value of which is to be discovered by solving an equation; a variable in a conditional equation 3y = 4x + 5 is an equation in two unknowns
And, yes, X is often used to stand for an unknown.