Hai Collection, Upper Volume Radical: Bone (gǔ) 骬 Kangxi Strokes: 13 Page 1448, Entry 05 Pronounced yu. Broad Glossary (Guangya): The term refers to the notch in the clavicle. Correct Meaning of Characters (Zhengzitong): The bone at the notch of the chest. Spiritual Pivot Classic (Lingshu Jing): From the collarbone notch down to the bone at the chest is nine inches in length.