X + Y sorting
= X + Y sorting
{wiki=X_+_Y_sorting}
X + Y sorting, also known as two-dimensional sorting, refers to a technique in which data points or elements are sorted based on two separate attributes or dimensions, typically represented as coordinates in a two-dimensional space (like points on a Cartesian plane). In this context, "X" represents the primary sorting key (the first dimension), while "Y" represents the secondary sorting key (the second dimension).