When in the diagram the z-axis is vertical and increases as you go up and the y-axis increases from left to right, and the x-axis should be interpreted as pointing straight out from the page increasing as it comes toward you then the diagram is an example of a right-handed system because it obeys the following “right-hand rule”: If the index finger of the right-hand points in the positive x direction and the middle finger of the right-hand points in the positive y direction, then the right thumb will naturally point in the positive z direction.
When in the diagram the z-axis is vertical and increases as you go up and the x-axis increases from left to right, and the y-axis should be interpreted as pointing straight out from the page increasing as it comes toward you then the diagram is an example of a left-handed system because it obeys the following “left-hand rule”: If the index finger of the left-hand points in the negative x direction and the middle finger of the left-hand points in the positive y direction, then the right thumb will naturally point in the positive z direction.