Benford's Law
noun
Ben·ford's Law ˈben-fərdz- 
: a law in statistics: the probability of a particular numeral n appearing in the first decimal place of an element of a set of numbers is equal to log10(1+¹/ₙ)
Note: This law describes how, in any given collection of numbers being studied, more of them will be likely to start with a 1 than any other number. 2's will appear at the beginning less often, 3's still less, and so on, at a predictable rate.
Word History
Etymology
after Frank Benford †1948 American physicist
Note: The probability was defined by Benford in "The Law of Anomalous Numbers," Proceedings of the American Philosophical Society, vol. 78, no. 4 (March 31, 1938), pp. 551-72.
First Known Use
1969, in the meaning defined above