Pratyāhāra is the drawing back of the senses from their objects, so that they follow the mind inward rather than pulling it outward. It is the hinge between the outer limbs of yoga and the inner ones. The Bhagavad Gītā’s image of the tortoise drawing in its limbs describes the same discipline.
Pratyāhāra
Withdrawal of the senses: the fifth limb of yoga, turning attention inward from sense objects.
Also: Pratyahara