sorry, I am curious about what does this japanese symbol represents. It's from the latest Kong's movie, Skull Island , and I believ it is taken from the fight airplane of a japanese pilot during second world war.
It is not a Japanese symbol or character including Katakana, Hiragana and Kanji. I think that the movie producer wanted to express Japanese exoticism and independently designed the symbol or character similar to Japanese imaginary symbol or character.
To me it looks like the symbol む (mu) which could be relevant if it was on a fighter plane. I say this because 'mu' also 無 which represents 'nothingness' in buddhism seems to me something a Japanese pilot may have written on their plane in the war. Not very well explained but I hope you get my gist.