Institutional Review Board 
Investment Review Board 
Integrated Routing and Bridging 
Improved Ribbon Bridge 
Indications Risks Benefits 
Institutional Review Boards 
Investment Review Boards 
Industrial Revenue Bond 
Inertial Reference Base 
Instruction Reorder Buffer 
Instrumentation/Relay Board 
Investment Review Board's 
Irish Republican Brotherhood 
Immigration and Refugee Board 
Inbound Recovery Board 
Incident Report Book 
independent review board 
Indirect Reference Buffer 
Individual Record Brief 
individual records brief 
Infinitely Rigid Bear 
Infrastructure Review Board 
Initial Ready Brigade 
inspiratory resistive breathing 
Institut Rugjer Boskovic 
Institute of Radiation Breeding 
Instrumentation Request Broker 
Intern and Resident to Bed 
Internal Ratings Based approach 
Internal Revenue Bulletin