The term is common in offline casinos. This technique used by professional blackjack players and some other gambling games with maps. It allows them to achieve mathematical superiority over the establishment and win more often.
Shuffle Tracking – way to track playing cards while the dealer shuffles them.
This is a complex technique, which is not owned by all professional players. It can be used in the careless work of the croupier if he doesn't shuffle the decks well enough.
Shuffle machines help casinos to deal with this trick.