Such a 4 letters-charactor use seems to be a Japanese style, not so common in chana, I think. But it is originally chanisese, one phrase apears in " Sun's art of War" . It is very famous in Japan for the motto written in the flag of his team in war, that is used by Singen TAKEDA, the famous samurai in SENGOKU piriod in Japan. 風：move speedy like wind, when it moves 林：keep quiete like woods(forest) 火：attack hard like a fire 山：keep no move like a mountain

http://en.wikipedia.org/wiki/F%C5%ABrinkazan