Na Yin Metal of the Sword Edge (剑锋金): the image of a pillar pair
Na Yin: Metal of the Sword Edge (剑锋金)
Na Yin assigns a poetic image to each consecutive pair of stem-branch combinations. "Metal of the Sword Edge" (Jian Feng Jin) belongs to the pairs 壬申 and 癸酉.
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 "Metal of the Sword Edge" appears in your structure.
Boundary
Na Yin images are cultural vocabulary, not statements of fact about a person.