Vr,
Thanks for the URL. Those drawings were pretty easy to follow. As I have been checking into as many resources as possible, I can tell you that within those two pages there are conflicts or different means for no less than 7 of those signs. Scary, isn't it?
This site was better than some resources where there are completely different meanings for EXACTLY the same signal. An example is DANGER and COLD. Both have more than one sign. I have also seen the same sign FOR both. Crossed fists over the chest is interpreted as "I am shivering (cold)" and as "a skull and crossbones (Danger)."
I thought "OK" was universal. Now, I see it's a question and not the right answer.
Amazing we are all still alive. I think turning blue is still the sign for "out of air" or does it mean, "I'm cold?"
Regards,