The meaning of the Acronym RRB is...

RRB is

• Railroad Retirement Board
• Radio Regulations Board

More Meanings For RRB:

• Radar Reflective Balloon
• Real Return Bonds
• Resource-Related Billing
• Rolls- Royce and Bentley Garages
• Reiner, Reiner, & Bendett, PC
• Real Return Bonds
• Robert R. Blair, Attorney at Law
• Reiner, Reiner, & Bendett, PC
• Rational Reason to Believe
• Red de Radiodifusión Bíblica
• Junta de Reglamento de Radiocomunicaciones
• Readiness Review Board
• Requirements Review Board
• Regular Re-Enlistment Bonus
• Reliability Requirements Board

RRB is also in:

• Accounting
• Firms
• Law
• Media
• Meteorology
• Military
• Stock Exchange