The meaning of the Acronym RRB is...

RRB is

• Railroad Retirement Board
• Radio Regulations Board

More Meanings For RRB:

• Radar Reflective Balloon
• Round Rod Bayonet
• Real Return Bonds
• Resource-Related Billing
• Rolls- Royce and Bentley Garages
• Reiner, Reiner, & Bendett, PC
• Real Return Bonds
• Readiness Review Board
• Requirements Review Board
• Regular Re-Enlistment Bonus
• Reliability Requirements Board
• Radar Reflective Balloon
• Reduced Readiness Battery
• Radar Range Bearing
• Readiness Review Board

RRB is also in:

• Accounting
• Firms
• Meteorology
• Military
• NASA
• Stock Exchange
• Unfiled