tens and face cards, the low cards which are two through six and the neutral cards which are seven through nine. the idea is that when a low card is dealt you will add one to your total. when a high card is dealt you will subtract one from the total and neutral cards will count as zero. if you do this correctly and run through a full deck of cards you should end up at zero since there are the same number of high cards as low cards in the deck.
counting the cards that come out of the deck will give you the running count; most people will really 