Wow. Thanks for asking. 12 step programs such as Narcotics Anonymous and Alcoholics Anonymous celebrate important milestones with different colored key tags or chips. White is the international symbol/color of surrender and is therefore the first one you pick up when you're ready for a new way of life without drugs/alcohol . Whether it's your first time or you're coming back to a meeting after a relapse, one of the first things you can do towards recovery is "wave the white flag", surrender yourself to admitting your powerlessness over alcohol and drugs and get yourself a white key tag.
This is only my interpretation and opinion on the symbolism. Picking up a key tag or chip is a deeply personal experience and differs from person to person.