1) Abacus users 2) American milk snakes 3) Bean counters 4) Bill checkers, at times 5) Bookkeepers, at times 6) Calculating snakes 7) Calculating vipers 8) Cash registers 9) Common vipers 10) Dangerous biters 11) Dangerous vipers 12) European vipers 13) Hognose snakes 14) Kraits 15) Math aces 16) Mathematical snakes