Well, in the old days there werent directionals on cars so people used them to turn and stop. Motorcycle drivers use them still and so do people who ride bikes. Down is stop, straight out is left and up is right.
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It means that you have been drawing on your hand!
"Putting the fingertips together (known as raised steepling) shows confidence, this is usually done when talking. The lowered steeple (where the fingers aren't straight or slightly interlaced) is usually used when listening." http://www.flippingheck.com/Psychology-Tuesday-Hand-Signals
Hand span is the distance from the tip of your thumb to the tip of your little finger when your hand is outstretched completely.
The size of the hand isn't relevant to anything important. However, in exercise, a bigger hand is seen as strength.
No