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The Magic Pivot (灵枢 líng shū, gǔ dù). A proportional standard for measuring parts of the body based on the size of bones.

Bone Standard
Body part	From … to ….	Cùn	Area applied
Head and Neck	Anterior hairline to posterior hairline	12	Forehead and nape
	Anterior hairline to acupoint between eyebrows (Hall of Impression)	3
	Posterior hairline to T7	3
	From one mastoid process (completion bone) to other	9	Horizontally between points of head
	From one frontal angle (ST-8) to other	9
Chest and Abdomen	Xiphoid process to umbilicus	8	Upper abdomen
	Umbilicus to pubic bone (transverse bone)	5	Lower abdomen
	Armpit to 11the rib	12	Rib-side
	Nipple to nipple	8	Chest and abdomen
	Clavicle to clavicle	8	Chest and abdomen in women
Upper Limbs	Anterior crease of armpit to elbow crease	9	Upper arm
	Elbow crease to wrist crease	12	Forearm
Lower Limbs	Upper horizonal edge of pubic bone to medial epicondyle of femur	18	Inner face of thigh
	Ball of femur to lower extremity of kneecap	19	Outer surface of thigh
	Lower gluteal crease (BL-36) to center of popliteal crease	15	Back of thigh
	Below external epicondyle of tibia (SP-9) to inner ankle bone	13	Medial aspect of lower leg
	Lower extremity of kneecap to outer ankle bone	16	Lateral face of lower leg

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