Hah Dahn Doh Rah Cha Ki is Doh Rah Cha Ki: Spin Kick performed between ankle and knee level. Beginning in offensive stance, initiate the turn by pivoting your lead foot. As you turn the first 180°, drop down to your left knee and look over your shoulder at your target. Whip your right leg around, foot on its side, striking with the heel. Use the momentum of the spin to bring yourself back up to stance.
See the example below of high, medium, and low spin kicks.