index

a numerical scale used to compare variables with one another or with some reference number

a number or ratio (a value on a scale of measurement) derived from a series of observed facts; can reveal relative changes as a function of time

a mathematical notation indicating the number of times a quantity is multiplied by itself

an alphabetical listing of names and topics along with page numbers where they are discussed

the finger next to the thumb

list in an index

provide with an index; "index the book"

adjust through indexation; "The government indexes wages and prices"