Black Belt (BB)

A role in Six Sigma by someone who has a strong expertise in the Six Sigma (and possibly Lean) tools and concepts. The actual functions and responsibilities for this role vary but in general this person has a full-time dedication to leading projects that may yield benefits that are considered moderate to large for the organization. Their projects generally cover a longer timeframe (like 3 to 6 months) and usually have a scope that extends across multiple functional areas. This is a role that is commonly certified by many training organizations, although the requirements for those certifications vary considerably. This role is considered to be above a Six Sigma Green Belt (GB) role.
Related StatStuff Video: 
   -Section 1-Introduction, Lesson #8 - Key Roles in a Lean or Six Sigma Project