In 12 Step meetings, they come in various forms: predominantly, Alcoholics Anonymous (A.A.) groups distribute plastic chips, while in Narcotics Anonymous (N.A.), they give out key tags. Coin, chip, key tag, medallion: “It’s not a badge of membership,” according to those distributing them at recovery meetings throughout the world, but as markers of clean time, sobriety medallions are the rabbits’ feet of those recovering from alcoholism and addiction.