those signals are horrible....
about as bad as the nonsense they teach in Mexico for "thousands on the wrist". Someone gave that to me last weekend when I asked for pressure and I was like "wtf are you talking about". If I ask you the gas, give it to me directly. In PSI countries, give it to me in hundreds of PSI, i.e. 3000= three, zero. In bar countries, give it in tens of bar, i.e. 200 bar=two, zero
@Diver0001 the problem with the signals that they indicated are that they are confusing and can easily be misinterpreted with other signals. Especially the variants of closed fist, and the arms crossed. With many of them being two handed, they are not compatible with technical diving of any variety, but especially in caves. Our one-hand signals are much less complex