1. hishi ( leaves of the water caltrop )is a term for unstable conditions. On a high level, such as war, civilwar and other unsure situations.
2. Sangokuzushi refers to a Chinese calculation system. Sango means calculate / wood, small sticks horizontally or vertically gives a number. Kuzushi is a martial arts term for unbalancing an opponent..
https://en.m.wikipedia.org/wiki/Kuzushi#:~:text=Kuzushi (崩し%3Aくずし) is,in the Japanese martial arts.&text=The noun comes from the,pull down%2C destroy or demolish.