root mean square

noun Mathematics.
the square root of the arithmetic mean of the squares of the numbers in a given set of numbers. Abbreviation: rms

Origin:
1890–95

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root mean square
 
n
rms the square root of the average of the squares of a set of numbers or quantities: the root mean square of 1, 2, and 4 is √[(1² + 2² + 4²)/3] = √7

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Root_mean_square is always a great word to know.
So is interrobang. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a scrap or morsel of food left at a meal.
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