In mathematics, skew refers to the difference between the mean and the median of the data. This means that A = [1000, 1000, 1000, 1000] and B = [10, 1000, 1000, 10] are both NOT skewed.
In the field of data streaming skew ofter refers to the data not being uniform, so there B, normal distribution, exponential distribution, Zipfian distribution would all be considered a skewed distribution (they have heavy elements).
What is the correct mathematical term to describe that kind of "skew"?