In American
Roulette the
Croupier marks the winning number by placing a
Marker made of wood or plastic on the
Roulette table on the square of the winning number. The score
Marker is called 'Dolly' because its outline resembles a doll. The purpose of the Dolly is to help players remember the winning number until all bets are paid and a new betting
Round begins.
The Dolly does not exists in French
Roulette where the
Croupier simply points a stick at the winning number.