Selection prerequisites: One or more points
If the marked coordinate system has a square or rectangular grid form, the coordinates are measured as an (x, y) pair.
If the marked coordinate system has a polar grid form, the coordinates are measured as an (r, θ) pair.
If you hold the Shift key while choosing this command, it becomes Abscissa & Ordinate or Polar Distance & Direction, depending on whether the coordinate system is rectangular or polar. In these cases, the command measures the coordinates (x and y or r and θ) as separate values, allowing you to use them as values in calculations and elsewhere.