We can use words like forward and backward to describe movement in a straight line. If a movement involves a turn, it can be either clockwise (the same way that the hands go around a clock) or anti-clockwise.
The long hand of this clock has turned clockwise a quarter turn from 12:00 to 12:17.
The arrow in this picture has turned anti-clockwise a half turn.
The arrow is pointing at 'A', how can we move the arrow to get it to point to 'B'?
Turn clockwise 1 quarter turn or turn anti-clockwise 3 quarters turn.