What Does This Symbol Mean To The Japanese? | ASIAN BOSS on Youtube
The symbol is fairly common in SE Asia and predates the symbolism of the 1930's to present in the Western world. I don't know that many SE Asians are aware of any Western meaning or at least it has no strength of meaning--rather it is just a symbol of good luck or to indicate yet another temple. Some early Christians also used the symbol--perhaps to indicate "well-being" in art, catacombs, church windows, etc.
Interesting video to see from a Japanese cultural perspective.