What Is Sword-Edge Metal (Jian Feng Jin)?
In a Nutshell
The NaYin of the Ren Shen and Gui You stem-branches: the White Emperor holding sway, hardness forged through a hundred refinings — the image of a sword's edge.
Quick facts
| Item | Detail |
|---|---|
| Stem-branches | Ren Shen, Gui You |
| NaYin element | Metal |
| Signature image | The White Emperor holding sway, hardness from a hundred refinings |
What is Sword-Edge Metal?
Sword-Edge Metal is one of the thirty NaYin (Melodic Elements) groups of the sexagenary cycle, covering the two stem-branches Ren Shen and Gui You. The sixty stem-branches are taken two at a time, in order, forming thirty groups; each group has its own NaYin name, and the Ren Shen–Gui You group is called "Sword-Edge Metal."
A NaYin's element can differ from the elements of its own stem and branch. Here, the stem Ren is Water and the branch Shen is Metal, while the NaYin is Metal — a coincidence with the branch in this group, not a rule. Check the chart rather than assuming.
"Sword-edge" is itself the image: the cutting edge of a blade. The *San Ming Tong Hui*'s chapter on NaYin images glosses it as "the White Emperor holding sway, hardness from a hundred refinings": the White Emperor of the West governs metal, and a sword's edge is only made through repeated forging — it describes metal-qi at its hardest and sharpest.
How to look it up: match the stem-branch of your Year Pillar or Day Pillar against the NaYin chart. For example, 1992 was a Ren Shen year and 1993 a Gui You year, so anyone born in those years carries Sword-Edge Metal as their Year Pillar NaYin; a Ren Shen or Gui You Day Pillar works the same way. MoZhu's built-in NaYin lookup tool lists the NaYin of all Four Pillars automatically from a birth time.
The Zi Ping school centers on the Day Master and treats NaYin as auxiliary reference only. Names like Sword-Edge Metal are essentially the ancients' evocative nicknames for stem-branch pairs; understanding the imagery helps you read classical texts, but nothing should be inferred from the name alone. This page is for study and reference only.
Classical sources
"Sword-Edge Metal: the White Emperor holding sway, hardness from a hundred refinings; red light shooting at the Dipper and Ox, the white blade congealed in frost and snow."
(Rendered from the classical Chinese original.)
Source: *San Ming Tong Hui* (Comprehensive Treatise on the Three Destinies), *Lun Na Yin Qu Xiang* (On the Images Adopted by NaYin)
Plain-language reading: Sword-Edge Metal takes the image of a sword's edge — the White Emperor of the West governs metal, and a sword is only made through a hundred refinings: metal-qi at its hardest and sharpest.
*For entertainment purposes only.*