| S&I | Standardization and Interoperability 
| Others |
| S&I | Standards and Interoperability
| Others |
| SI | Icelandic Society for Information
| Others |
| SI | International System
| Others |
| SI | Kennedy Space Center Support Operations Directorate
| Others |
| SI | Province of Siena
| Others |
| SI | s for in
| Others |
| SI | s for International
| Others |
| SI | Sacro Iliac
| Others |
| SI | Sacroiliac
| Others |
| SI | Safe Intake
| Others |
| SI | Safety Index
| Others |
| SI | Sagittal Index
| Others |
| SI | Saline Infusion
| Others |
| SI | Saline Injection
| Others |
| SI | Salt Institute
| Others |
| SI | Samahang Ilokano
| Others |
| SI | Sanctioned Individual
| Others |
| SI | Sandwich Islands
| Others |
| SI | Sarekat Islam
| Others |
| SI | SAS Institute
| Others |
| SI | Satiety Index
| Others |
| SI | Saturation Index
| Others |
| SI | School of Information
| Others |
| SI | Schweizer Informatik Gesellschaft
| Others |
| SI | Schweizer Informatiker Gesellschaft
| Others |
| SI | SCI Corporation
| Others |
| SI | Science Industrielle
| Others |
| SI | Scientific Instrument
| Others |
| SI | Scientific Instrumentation
| Others |
| SI | Secondary Infertility
| Others |
| SI | Secondary Insurance
| Others |
| SI | Secure Internet
| Others |
| SI | Seed Implantation
| Others |
| SI | Selectable Interface
| Others |
| SI | Selectivity Index
| Others |
| SI | Self Indulgance
| Others |
| SI | Self Indulgent
| Others |
| SI | Self Inflicted
| Others |
| SI | Self Injure
| Others |
| SI | Self Injury
| Others |
| SI | Self Insert
| Others |
| SI | Self Inserted
| Others |
| SI | Self Insertion
| Others |
| SI | Self Instertiong
| Others |
| SI | Self-Inflicted
| Others |
| SI | Seller Id
| Others |
| SI | Seller Identification
| Others |
| SI | Semi Iterative
| Others |
| SI | Semi-Insulating
| Others |
| SI | Sensitivity Index
| Others |
| SI | Sensory Imagery
| Others |
| SI | Sensory Imageryre
| Others |
| SI | Sequential Injection
| Others |
| SI | Serial Index
| Others |
| SI | Serious Illness
| Others |
| SI | Serious Injury
| Others |
| SI | Seriously Ill
| Others |
| SI | Serum Iron
| Others |
| SI | Severity Index
| Others |
| SI | Sexual Intercourse
| Others |
| SI | Sexually Inactive
| Others |
| SI | Sexually Inexperienced
| Others |
| SI | Shahrizat Ismail
| Others |
| SI | Shift In
| Others |
| SI | Shitty Intuition
| Others |
| SI | Shock Index
| Others |
| SI | SI is
| Others |
| SI | Siberian Islands
| Others |
| SI | Side Impact
| Others |
| SI | Side Information
| Others |
| SI | Siena (Provence)
| Others |
| SI | Signal Integrity
| Others |
| SI | Signal Intensity
| Others |
| SI | Signed Integer
| Others |
| SI | Signed Integers
| Others |
| SI | Silay Institute
| Others |
| SI | Silent Infarction
| Others |
| SI | Silent Ischaemia
| Others |
| SI | Silicon
| Element |
| SI | Silicon in
| Others |
| SI | Silicon Investor
| Others |
| SI | Silicone
| Others |
| SI | Silly I
| Others |
| SI | Simple Interest
| Others |
| SI | Simply Irresistible
| Others |
| SI | Sine Integral
| Others |
| SI | Singh Index
| Others |
| SI | Singhalese
| Others |
| SI | Single Inheritance
| Others |
| si | Sinhalese
| Others |
| SI | Sino Indian
| Others |
| SI | Sinus Irregularities
| Others |
| SI | SiR in
| Others |
| SI | Site Investigation
| Others |
| SI | Situs Inversus
| Others |
| SI | Skynet Airlines
| Others |
| SI | Slight Inclusion
| Others |
| SI | Slight Inclusions
| Others |
| SI | Slightly Imperfect
| Others |
| SI | Slightly Included
| Others |
| SI | Slightly Insane
| Others |
| SI | Slovenia
| Others |
| si | Slovenia (TLD)
| Others |
| SI | Slovenia international
| Others |
| SI | Slow and Ignorant
| Others |
| SI | Slow Import
| Others |
| SI | Small Inclusion
| Others |
| SI | Small Interface
| Others |
| SI | Small Intestine
| Others |
| SI | Smithsonian Institute
| Others |
| SI | Smithsonian Institution
| Others |
| SI | Smoke Inhalation
| Others |
| SI | Smoking Index
| Others |
| SI | Snoring Index
| Others |
| SI | Snow and ice
| Others |
| SI | Social Infrastructure
| Others |
| SI | Social Interaction
| Others |
| SI | Social Issues
| Others |
| SI | Socialist International
| Others |
| SI | Societas Iesu
| Others |
| SI | Society of Indexers
| Others |
| SI | Socket Interface
| Others |
| SI | Soft Intermediate
| Others |
| SI | SoftImage Graphics
| Others |
| SI | Software Independent
| Others |
| SI | Software Interrupt
| Others |
| SI | Solar Inertial
| Others |
| SI | Solidaridad e Igualdad
| Others |
| SI | Solidaritat Catalana per la Independència
| Others |
| SI | Solution Integration
| Others |
| SI | Solutions Infini
| Others |
| SI | Something In
| Others |
| SI | Source Index
| Others |
| SI | Southern Islands
| Others |
| SI | Southport Inn
| Others |
| SI | Space Invaders
| Others |
| SI | Spark Ignition
| Others |
| SI | Spark-Ignition
| Others |
| SI | Speaker Independent
| Others |
| SI | Special Inquiry
| Others |
| SI | Special Intelligence
| Others |
| SI | Special Interest
| Others |
| SI | Special Investigations
| Others |
| SI | Special Investigator
| Others |
| SI | Speech Impaired
| Others |
| SI | Speech/Language Impairment
| Others |
| SI | Spinal Injury
| Others |
| SI | Spokane International Railroad
| Others |
| SI | Spokane International Railroad (Union Pacific Railroad)
| Others |
| SI | Sporrs Ideas
| Others |
| SI | Sport Ident
| Others |
| SI | Sport Influenced
| Others |
| SI | Sport Injected
| Others |
| SI | Sport Injection
| Others |
| SI | Sports Illustrated
| Others |
| SI | Sports Information
| Others |
| SI | Sports Injected
| Others |
| SI | Sports Injection
| Others |
| SI | Sports Interactive
| Others |
| SI | Sporty Intellect
| Others |
| SI | St. Ignatius College Preparatory
| Others |
| SI | Stability Index
| Others |
| SI | Stand for Ie
| Others |
| SI | stand for Incorrect
| Others |
| SI | Stand-In
| Others |
| SI | Standard Image
| Others |
| SI | Standard Interface
| Others |
| SI | Standard International
| Others |
| SI | Standing Instruction
| Others |
| SI | Standing Instructions
| Finance, Banking |
| SI | Standing Instructions
| Others |
| SI | Stark Industries
| Others |
| SI | Staten Island
| Others |
| SI | Station Inspector
| Others |
| SI | Statutory Instrument
| Others |
| SI | Stereo Input
| Others |
| SI | Stochastic Interest
| Others |
| SI | Stockmarket Indices
| Others |
| SI | Stop It
| Others |
| SI | Stratum Intermedium
| Others |
| SI | Stress Incontinence
| Others |
| SI | String Instrument
| Others |
| SI | Stroke Index
| Others |
| SI | Structural Injunction
| Others |
| SI | Structured Interview
| Others |
| SI | Stuck Ina
| Others |
| SI | Student Improvement
| Others |
| SI | Student Instructor
| Others |
| SI | Stupid Idiot
| Others |
| SI | Stupid Investigators
| Others |
| SI | Sub Indices
| Others |
| SI | Sub Inspecter
| Others |
| SI | Sub Inspector
| Others |
| SI | Sub-Inspector
| Others |
| SI | Substantia Innominata
| Others |
| SI | Substitution Instance
| Others |
| SI | Suicidal Ideation
| Others |
| SI | Sultan Ismail
| Others |
| SI | Sumatra Interactive
| Others |
| SI | Summer Intensive
| Others |
| SI | Super Insulation
| Others |
| SI | Superior/Inferior
| Others |
| SI | Supplemental Instruction
| Others |
| SI | Supplementary Instruction
| Others |
| SI | Support Installation
| Others |
| SI | Survey of India
| Others |
| SI | Survival Index
| Others |
| SI | Survival International
| Others |
| SI | Svenska Institutet
| Others |
| SI | Swarm Intelligence
| Others |
| SI | Swiss Informaticians Society
| Others |
| SI | System Integrator
| Others |
| SI | System Integrators
| Others |
| SI | System International
| Others |
| SI | Systeme Internationale
| Others |
| SI | Systems Integral
| Others |
| SI | Systems Integrated
| Others |
| SI | Systolic Index
| Others |
| SI | The international system of units
| Others |
| SI | United States Strategic Command Strategic Instruction
| Others |