A variable
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"n" stands for an unknown number.
X Stands for Unknown was created on 1984-02-10.
Four times the unknown number. Let's say the unknown number is x. x + 3x = 4x
It is a variable - a letter that stands for a number that is either unknown (has yet to be calculated), or for generic calculations.
If a perimeter of 8 is obtained by adding 5 and unknown number, then the unknown number is 3.2.