Crossing Fingers

On my t-shirt, which is a gift from my American friend, crossing fingers illustration are printed.

I like it, so I often wear it.

In Europe and the United States, crossing fingers mean "cross" and "good luck."

However, the sign means something like "barrier from dirty things" in Japan, so actually we shouldn't use it too much.

Furthermore in Vietnam, I heard it means an insult.

Since the meanings of hand signs are different between countries, we have to be careful when we use them.