It is a popular name that is said to have been written on the flag sashimono (military flag) of Sengoku daimyo Takeda Shingen.
“Furinkazan” is a word used to indicate the movement in the event of a war. When it should move as quickly like the wind, and when it should wait like a forest, and Invade like a fiery fire when taking action, When it’s time to protect, stand like a mountain. It’s respond flexibly according to the situation.
In turn, in “how to deal with things”, an idiom that means an appropriate way of moving according to the time and situation.
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