Which measure is defined as the standard deviation squared?

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Variance is defined as the standard deviation squared. It measures how spread out the data are by averaging the squared deviations from the mean. In other words, variance is the mean of the squared differences from the average, and the standard deviation is simply the square root of that number. The other measures describe dispersion differently: the standard deviation stays in the same units as the data, mean absolute deviation uses absolute values of deviations rather than squaring them, and the range is just the difference between the maximum and minimum values. For a quick intuition, if you take the standard deviation and square it, you get the variance.