The common measures of location are quartiles and percentiles Quartiles are special percentiles. The first quartile, Q1, is the same as the 25th percentile, and the third quartile, Q3, is the same as the 75th percentile.
The "center" of a data set is also a way of describing location. The two most widely used measures of the "center" of the data are the mean(average) and the median.