shū (樞)

a pivot, axis, or hub; the ‘center’ around which other things rotate; shū (樞) has special meaning in Nèijīng, where it is the second character in the title of Língshū. In Língshū 5, shū (樞) is used with “open” and “closed” to pair channels according to their primal movements, as differentiated with the liùhé (六合), rather than the more familiar pairings according to the wǔxíng (五行). In that chapter, the shū (樞) pair are shaoyáng (少陽) and shaoyīn (少), which regulate the relationship between open and closed, and between externalizing and internalizing.

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