I showed it to someone from Europe -- I forget where, exactly -- and he also had never seen it before.

Also, I met an older gentleman from the American southwest many years ago, and I noticed he was using an interesting gesture for 'goodbye'  that was kind of like the start of a wave that sort of morphed into the hand being horizontal, palm down, and going from the middle of the chest outward.

I recognized that last part of it as the Native American sign for 'good'.

The 'literal' translation is: "Level with the heart."