(math) second power; square of a number; equivalent to [[平方|平方|ping2 fang1]]

the number that when multiplied by itself equals a given number

a mathematical method used in statistics to find the best-fitting curve for a set of data by minimizing the sum of the squares of the vertical deviations

statistical method used in data analysis to find the best-fitting curve or line by minimizing the sum of the squares of the vertical deviations