Council for the Securities Industry - Levy - British
Sacra Congregatio Indicis - Sacred Congregation of the Index - Latin
Safari Club International (EA)
San Clemente Island - California - Seismograph station code, US Geological Survey (SEIS)
Sand Collectors International (EAIO)
Santa Cruz Island (MUGU)
Santangelo Consultants, Inc. - Commercial firm
Savio Club International - Defunct (EA)
Scalable Coherent Interface (SAUS)
Scale (ECII)
Scaleable Coherent Interface - Computer science
Schafer Consulting, Inc. - Commercial firm
Schedule-Cost Index (MCD)
Schintad - NCIC firearms make code (NCIC)
School of Counter-Insurgency (SAUS)
Science (AFM)
Science Citation Index (STED)
Science Consultants to Industry - Commercial firm
Science Curriculum Improvement - Study - Education
Science of Creative Intelligence - Transcendental meditation
Scientific Attache - Foreign service
Scientific Computer, Inc. (SAUS)
Scientific Computers, Inc. (MCD)
Scientific Computing and Imaging Institute - University of Utah (RCD)
Scirocco - NCIC car model code
SCI Satellite Conferencing International Corp. - Formerly, Valclair Resources, Ltd. - Vancouver Stock Exchange symbol
Scisearch on-line citations database (SAUS)
SCI Systems - nyse symbol (SPSG)
Scottish Central Institutions (ODA)
Seabee Club International (EA)
Sea Containers Inc. - Steamship (MHDW)
Sealable Coherent Interface - Computer science
Seal Compatibility Index (SAUS)
Seamens Church Institute (SAUS)
Seamen's Church Institute of New York/New Jersey (EA)
Secret Compartmented Information (WPI)
Secret Confidential Informant (SAUS)
Secure Compartmental Information (ACAE)
Security Container Institute - Defunct (EA)
Selected Configured Item (MCD)
Seminar Clearinghouse International, Inc. - Information service or system (IID)
Sensitive Compartmented Information - Military
Sensitive Compartmented Intelligence
Sequential Circuits Inc. (SAUS)
Sequential Comparison Index - Measures effect of chemical pollution in lakes and streams
Serial Communication Interface - Computer science
Serial Communications Interface (SAUS)
Service Change Information (MCD)
Service Civil International - International Voluntary Service - India
SES - Shuttle Engineering System Cockpit Interface - NASA (SSD)
Sexual Communications Inventory - Marital relations test - Psychology
Shapiro Control Inventory - Test (TMMY)
Ship Control and Interception (SAUS)
Ship Controlled Intercept - RADAR - Navy
Shipping Container Institute
Shipping Corp. of India (BUAC)
Shipping Corp. of India Ltd.
Shipping Corporation of India (SAUS)
Ship's Capability Impaired - Navy
Short Circuit
Short Crus of Incus (STED)
Signal Corps Item - Obsolete - Army (NATG)
Sign Check Indicator (SAUS)
Simulation Councils, Inc.
Single-Channel Interface - Computer science
Single Column Inch (ADA)
Sister Cities International (EA)
Site of Community Interest (EURO)
Slot Cell Inserter
Small Craft Instructor - Red Cross
Smoke Curtain Installation - British military (DMA)
Societe Canadienne d'Immunologie - Association - Canada (EAIO)
Societe de Chimie Industrielle (EA)
Society of Chemical Industries (NADA)
Society of Chemical Industries (or Industry) (SAUS)
Society of Chemical Industry (EA)
Society of Chiropodists in Ireland (BUAC)
Society of Composers (EA)
Society of Composers, Inc. (BUAC)
Society of Computer Intelligence (IAA)
Society of the Chemical Industry (NADA)
Soft Cast Iron
Software Configuration Item - Computer science
Software Customer Inspection
Soil Consultants, Inc. (EFIS)
Source Code Indicator (MCD)
Southern Cross International - England (BUAC)
Spacecraft Inc. (SAUS)
Speaking Circles International - Commercial firm
Special Cargo Airlines - Russian Federation - ICAO designator (FAAC)
Special Compartmented Information (SAUS)
Special Compartmented Intelligence - DoD (MCD)
Special Control Instruction (SAUS)
Special Control Item - Code
Special Crash Investigation - Automotive safety
Special Customs Invoice
Specialty Consultants, Inc. - Commercial firm
Specific Case Inventory - Test - London House, Inc. (TES)
Spinal Cord Injury - Medicine
Spinal Cord-Insured (MCD)
Sponge and Chamois Institute (EA)
Sri Lankan Creole Malay - Language code (ETLW)
Stacker Control Instruction (SAUS)
Staging Connections, Inc. - Telecommunications service (TSSD)
Stampe Club International (EA)
Staphylococcal Infection - Medicine (MELL)
State College of Iowa (UWER)
State Commission of Investigation (SAUS)
Steel Construction Institute - British (IRUK)
Stein Collectors International (EA)
Stem Cell Inhibitor - Cytology
Stock Card Index (SAUS)
Stone Care International
Strategic Change, Inc. - Commercial firm
Strategic Computing Initiative (ACAE)
Strategic Connections, Inc. - Commercial firm
Stratospheric Circulation Index - Geophysics
Streptococcal Infection - Medicine (MELL)
Stroke Club International (EA)
Structered Clinical Interview (SAUS)
Structural Composites Industries (SAUS)
Structured Clinical Interview
Student Centered Instruction - Training term (LPT)
Success Motivation Institute (SAUS)
Summer Computer Institute (SAUS)
Supervisor Call Instruction (IAA)
Supervisory Cost Inspector - Navy
Surface Charge Imaging (AAEL)
Sustainable Computing Initiative
Swaythling Club International (BUAC)
Swedish Ceramic Institute (BUAC)
Switch Closure In (MCD)
Switched Collector Impedance - Electronics (OA)
System Command Interpreter (TIMI)
System Control Interface
System Control Interrupt - Computer science (MWOL)
Systemics, Cybernetics and Informatics
Systems Control Inc. (SAUS)
Science (ELAL)
Switch Closure In (NAKS)
Science - A publication (BRI)
Scientific (AL)
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