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In math, the letter "n" is commonly used as a variable to represent a number that is not specified. It is often used in equations and formulas to indicate a variable quantity that can take on different values.
Oh honey, it's the letter 'N'. Just kidding, it's actually the letter 'N'. Noble gases are represented by the letter 'N' in the periodic table. Hope that clears things up for ya!
North
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Sodium for a chemist. NA can represent North America NA can represent Not Applicable (normally shown as n/a)
The letter "c" is used to represent the speed of light in a vacuum in physics equations.