(epidemiology) The first documented patient in a disease epidemic within a population or the first case of interest in an epidemiological investigation; the case of patient zero.

(mathematics) The divisor function of an integer divided by the integer.

A measure of the ability of an off-road vehicle to flex its suspension

(computer science) Synonym of Fenwick tree

plural of binary indexed tree

plural of stock market index

(meteorology, physiology) A measure of the reaction of the human body to a combination of heat and humidity.

A readability metric for English writing, estimating how many years of formal education a person needs in order to understand the text on the first reading. It is based on the average sentence length and the proportion of words of three or more syllables.

(economics) Synonym of Hoover index

(UK, economics) A measure of inflation based on the changing cost of a representative sample of retail goods and services. Calculated on a slightly different basis to the Consumer Price Index.