Body Language (blackjack)
A set of non-verbal signals radiated by a dealer, which can
be distinguished by the player;
(i.e. a dealer standing at an empty table with his arms folded
across his chest is telling the player that he doesn't want
to deal.)
One reason some casino's do not allow the dealer to look under
a 10-value card for a Blackjack is that the dealer may inadvertently
give information about the value of the hole card to an astute
player (i.e. if the dealer looks at the hole card and then looks
back again to double check, then the value of the hole card
is probably a "4."
