What are the abbreviations I see at online blackjack casinos?
For the sake of brevity, most of the table rules are abbreviated. Knowing what is allowed and not allowed will make the game easier for you. Some of the abbreviations used can seem like foreign languages until you get used to them. The most common ones are:
BSE: Basic Strategy Edge meaning you can get better odds using your basic strategy
DOA: Double Down on any of your initial cards
D10/11: You can only double down on 10s and 11s
DAS: Double down is only allowed when you split a pair.
ESR: Early surrender allowed. You won't find this often, but when you do you can surrender your initial hand when the dealer has a natural blackjack (21).
H17: This means that when the dealer has 17 (as soft hit) he must hit.
LSR: Late surrender. You can surrender your hand, only losing half of your bet when the dealer gets a non-natural blackjack (21).
O/U: You can bet over and under thirteen
RSA: You can re-split Aces
S17: The dealer must stand on soft 17 (stick on 17).