A plethora of "codes" are used by meetings to help define how a group operates.
B = Beginner, C = Closed, Crystal Meth Addicts, D = Discussion, G = Gay, G/L = Gay/Lesbian, H = Handicapped Accessible, HI = Interpreted Hearing Impaired, HS = Hospital, I = Institutional,  K = Kids welcome, L = Lesbian,  LS = Literature Study, MS = Men's Stag, NS = Non-Smoking, O = Open (guest welcome), SS = Step Study, SP = Spanish-speaking, SPK = Speaker, WS = Women's Stag, SA = Smoking, Y = Younger People.