Heavenly pillar - Tenchu

Japanese: 天柱 - てんちゅう

[1] [noun] An imaginary pillar that holds up the sky to prevent it from falling. It is also used as an analogy for the morality that supports the world. → Diwei. [Shuyanziko Jieyongshu (1717)] [Shiji - Records of the Grand Historian - Records of the Three Emperors] [2] The name of a star. [1] The five stars in the Ziwei Palace. It is located near the north pole of the constellation Cepheus. [Xingjing - Scrolling, Pillar of Heaven] [2] Another name for the Sandai Star. [Zhoulishu - Spring Official, Grand Master]

Ten-ji ...ji [Heaven's Pillar]

〘Noun〙 = Tenju (turning hand) ※From the Joruri play Keisei Hangonko (around 1708) "The husband sings and the woman tilts her face to the tenji (pillar of the shamisen) ."

Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information

Japanese:

[1] 〘名〙天が落ちてこないようにささえているという想像上の柱。また、世をささえる道義のたとえにいう。→地維(ちい)。〔書言字考節用集（1717）〕〔史記‐三皇本紀〕[2] 星の名。[一] 紫微宮の中にある五星。ケフェウス座の北極に近い所にある。〔星経‐巻上・天柱〕[二] 三台星の別称。〔周礼疏‐春官・大宗伯〕