| R&I | Receipts and Issues 
| Others |
| R&I | Receiving and Inspection
| Others |
| R&I | Records and Identfication
| Others |
| R&I | Records and Identification
| Others |
| R&I | Remove and Install
| Others |
| R&I | Research and innovation
| Others |
| R&I | Research and Investigation
| Others |
| R/I | Receiving Inspection
| Others |
| RI | Chicago, Rock Island and Pacific Railroad
| Others |
| RI | Lotus 1-2-3 Data
| Others |
| RI | R Or I
| Others |
| RI | Radiation Intensity
| Others |
| RI | Radical Initiator
| Others |
| RI | Radically Inert
| Others |
| RI | Radio Intercept
| Others |
| RI | Raffles Institution
| Others |
| RI | Ramblin Irishman
| Others |
| RI | Rambling Irishman
| Others |
| RI | Random Index
| Others |
| RI | Random Insanity
| Others |
| RI | Randomly Initialized
| Others |
| RI | Randomly Inversed
| Others |
| RI | Rapid Insert
| Others |
| RI | Rapist Institution
| Others |
| RI | Rate Information
| Others |
| RI | Rather Interesting
| Others |
| RI | Raw Indication
| Others |
| RI | Re-Installing
| Others |
| RI | Read Intensive
| Others |
| RI | Readership Institute
| Others |
| RI | Real Interest
| Others |
| RI | Rear Impact
| Others |
| RI | Receiver Induced
| Others |
| RI | Recitation Instructor
| Others |
| RI | Recording Industry
| Others |
| RI | Recurrence Interval
| Others |
| RI | Red Inner
| Others |
| RI | Redline Imports
| Others |
| RI | Reference Implementation
| Others |
| RI | Reference Intake
| Others |
| RI | Referential Integrity
| Others |
| RI | Referral Interviews
| Others |
| RI | Refractive Index
| Others |
| RI | Refugees International
| Others |
| RI | Regina Imperatrix
| Others |
| RI | Regina Imperiatrix
| Others |
| RI | Region I
| Others |
| RI | Register I
| Others |
| RI | Rehabilitation International
| Others |
| RI | Relaciones Industriales
| Others |
| RI | Related Injury
| Others |
| RI | Relative Intensity
| Others |
| RI | Relative Interior
| Others |
| RI | Relative Inverse
| Others |
| RI | Relief Intensity
| Others |
| RI | Relief International
| Others |
| RI | Remote Influencing
| Others |
| RI | Remote Intersepter
| Others |
| RI | Renal Insufficiency
| Others |
| RI | Render Interface
| Others |
| RI | Renderman Interface
| Others |
| RI | Repec Index
| Others |
| RI | Replaceable Item
| Others |
| RI | Reporting Identifier
| Others |
| RI | Reporting Information
| Others |
| RI | Reproductive Isolation
| Others |
| RI | Repubblica Italiana
| Others |
| RI | Republic Of Indonesia
| Others |
| RI | Republik Indonesia
| Others |
| RI | Repulsion Induction
| Others |
| RI | Research Institute
| Others |
| RI | Research Interviewer
| Others |
| RI | Reserve Index
| Others |
| RI | Residual Income
| Others |
| RI | Resistive Index
| Others |
| RI | Resolution of Identity
| Others |
| RI | Respiratory Illness
| Others |
| RI | Respiratory Infection
| Others |
| RI | Rest Interval
| Others |
| RI | Restricted Issue
| Others |
| RI | Retarded Institution
| Others |
| RI | Retention Index
| Others |
| RI | Retention Interval
| Others |
| RI | Retrograde Inversion
| Others |
| RI | Return Index
| Others |
| RI | Revista de Istorie
| Others |
| RI | Rex Imperator
| Others |
| RI | Rex Ipse
| Others |
| RI | RF Interonics
| Others |
| RI | Rhode Island
| State |
| RI | RI is
| Others |
| RI | Rieti (Provence)
| Others |
| RI | Right Inboard
| Others |
| RI | Right Indication
| Others |
| RI | Rights Issue
| Others |
| RI | Rigorous Imprisonment
| Others |
| RI | Rim Intensity
| Others |
| RI | Ring In
| Others |
| RI | Ring Indicator
| Others |
| RI | Ring It
| Others |
| RI | Ringlet Identifier
| Others |
| RI | Rock Island
| Others |
| RI | Rockwell International
| Others |
| RI | Rollback Info
| Others |
| RI | Rosenbluth International
| Others |
| RI | Rotary International
| Others |
| RI | Rotation Invariant
| Others |
| RI | Round Island
| Others |
| RI | Routing Identifier
| Others |
| RI | Routing Indicator
| Others |
| RI | Routing Instance
| Others |
| RI | Royal Institution of Great Britain
| Others |
| RI | Royalty Interest
| Others |
| RI | Ruben Israel
| Others |
| RI | Ruby Interactive
| Others |
| RI | Rule Induction
| Others |
| RI | Rule of Interpretation
| Others |
| RI | Run In
| Others |
| RI | Rutherford Institute
| Others |
| RI | The Republic of Ireland
| Others |