The cloth covered betting area on a roulette table is known as the “layout”. The layout is either single zero or double zero. The European style layout has a single zero, and the American style layout is usually a double zero. The American style roulette table with a wheel at one end is now used in most casinos. The French style table with a wheel in the centre and a layout on either side is rarely found outside of Monte Carlo.
American roulette layout and wheel, with single and double zero
European roulette layout and wheel, with single zero
French layout single zero wheel