Heaven here means "upper". The cervical spine was called "zhugu" (pillar bone} in ancient times and tianzhu is lateral to it.

Tianzhu BL10: Nomenclature, Location, Function, Indication, Method

Nomenclature: Tian: heaven       Zhu:pillar Heaven here means “upper”. The cervical spine was called “zhugu” (pillar bone) in ancient times and the point, tianzhu is lateral to it. Point: BL10 Chinese Name: 天柱 Name: Tianzhu English Name/Meaning: Celestial Pillar Pinyin: tiān zhù Han Geul 한글: cheon ju 천주 Romaji: ten chū Vietnamese:Thiên trụ Location:…