Roulette Wikipedia
Directly beneath the numbers are three clean areas (on some layouts these are marked “2 to 1” and are located on the players’ side of the table). On either side of these or along one aspect of the columns are rectangular areas marked “1st 12,” “2nd 12,” and “3rd 12” on American-style layouts. On European-style layouts these terms are “12p” (première), “12m” (milieu), and “12d” (dernière douzaine). Six more areas are marked “red” (rouge), “black” (noir), “even” (pair), “odd” (impair), “1–18” (low, or manque), and “19–36” (high, or passe). Many roulette players underestimate the significance of the odds for every sort of wager to achieve success.