shinogi
Noun
Meaning
shinogi
On a Japanese sword or knife, the ridge line where the angle meets the flat part of the blade.
Examples
A flat or narrowing shinogi is called shinogi-hikushi, whereas a fat blade is called a shinogi-takushi.
However, swords could narrow down to the shinogi, then narrow further to the blade, or even expand outward towards the shinogi then shrink to the blade (producing a trapezoidal shape).
In the earlier picture, the examples were flat to the shinogi, then tapering to the blade.
Details such as the ridge line (shinogi) another distinctive characteristic of the Japanese sword, are added at this stage of the process.