Final answer:
The movement of the foot turning its plantar surface laterally is termed eversion, which involves the intertarsal joints, distinct from ankle joint movements like dorsiflexion and plantar flexion.
Step-by-step explanation:
The movement that occurs when you move your foot so that the plantar surface (bottom of your foot) faces laterally is known as eversion. This action involves the intertarsal joints of the foot rather than the ankle joint. Eversion turns the bottom of the foot away from the midline of the body. It is one of the complex movements that contribute to stabilizing the foot when walking on uneven surfaces or changing direction rapidly in sports. This is distinct from other ankle movements such as dorsiflexion, plantar flexion, and inversion, which move the foot in different directions.