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Ace-to-Six Lowball
Any variation of poker in which players attempt to make the weakest poker hand possible instead of the strongest, in which Aces are low cards, and in which straights and flushes count as high hands; lowball in which the best possible hand is 6-4-3-2-A without a flush.

The best possible hand in Ace-to-Six Lowball is 6-4-3-2-A without a flush, as opposed to the best possible hands of 7-5-4-3-2 without a flush in Deuce-to-Seven Lowball and 5-4-3-2-A regardless of suit in Ace-to-Five Lowball.
 
Australian Poker Weekly