Na Yin Water from the Spring (泉中水): the image of a pillar pair
Na Yin: Water from the Spring (泉中水)
Na Yin assigns a poetic image to each consecutive pair of stem-branch combinations. "Water from the Spring" (Quan Zhong Shui) belongs to the pairs 甲申 and 乙酉.
How Na Yin is used
Traditional readers use Na Yin as a texture layer — an image for the quality of a pillar pair — rather than as a prediction. Different schools weight it differently.
Where you can see it
Build a chart on MingLens to see the Na Yin of your year pillar and check whether "Water from the Spring" appears in your structure.
Boundary
Na Yin images are cultural vocabulary, not statements of fact about a person.