What does SPI stand for?

Die Sprache der Palmyrenischen Inschriften - Leipzig - A publication (BJA)

Illinois State Library, Springfield (SAUS)

Illinois State Library, Springfield, IL - OCLC symbol (OCLC)

Sacramento Properties Incorporated

Safeguarding Proprietary Information

Sales Performance International, Inc. - Commercial firm

Saponi - Language code (ETLW)

Scanning Pulse Immobilization

Scatter Plate Interferometer (SAUS)

Schaumburg and Polk, Inc. - Commercial firm

Schedule Performance Index (MCD)

Scientific Performance Index (SAUS)

Scientific Placement Inc (SAUS)

Scottish Power ADS - NYSE symbol (SPSG)

Scottish Provident Institution - Commercial firm

SCSI Parallel Interface (SAUS)

Secondary Protocol Identifier (TNIG)

Secretariats Professionnels Internationaux

Secure Processing Interface (SAUS)

Security Parameters Index

Selected Period Investment - Finance (WDAA)

Selective Population Inversion - Physics

Self Paced Instruction (SAUS)

Self-Paced Instruction (IEEE)

Self Perception Inventory (SAUS)

Self-Perception Inventory - Personality development test - Psychology

Semi-Permanent Information (SAUS)

Semi Process Inc. (NITA)

Senior Patrol Inspection - Immigration and Naturalization Service

Senior Patrol Inspector (SAUS)

Septum-Equipped Programmable Injector - Gas chromatography

Sequence of Pulse Intervals

Serial Peripheral Interconnect (READ)

Serial Peripheral Interface - Electronics

Serial-Peripheral Interface protocol (SAUS)

Series-Parallel Interface - Computer science

Serum Precipitable Iodine - Serology

Server Protocol Interpreter (SAUS)

Service Pedalogique Interafricain

Service Practice Instrumentation (SAUS)

Service Provider Interface - Computer science

Service Publication Instruction (AAG)

Severely and Profoundly Impaired

Shared Peripheral Interface

Share Price Index (ADA)

Shipley Personal Inventory - Medicine (DMAA)

Ship-Port Interface (SAUS)

Ship's Plan Index

Sierra Pacific Industries

Signal Point Identification (IAA)

Signal Presence Indicator (CAAL)

Single Particle Impact (SAUS)

Single Point Injection - Automotive engineering

Single Process Initiative

Single Processor Interface

Single Program Indicator (SAUS)

Single Program Initiated - Computer science (IAA)

Single Program Initiation - Computer science

Single Program Initiator - Computer science (ECII)

Sisters of Perpetual Indulgence (SAUS)

Site Peculiar Interference (AAG)

Site Population Index - Nuclear energy (NRCH)

Slagging Pyrolysis Incinerator (SAUS)

Smoke Point Improvement - Petroleum refining

Smoking Policy Institute (EA)

Societe pour l'Informatique - Company for Informatics - Information service or system - Defunct (IID)

Society for Prevention of Infertility (EA)

Society of Photographic Illustrators (EA)

Society of Practitioners of Insolvency (BUAC)

Society of Professional Investigators (EA)

Society of the Plastics Industry (EA)

Society of the Plastics Industry, Inc. (SAUS)

Software in the Public Interest

Software Patent Institute (SAUS)

Software Patents Institute

Software Process Improvement (AAEL)

Software Products International (SAUS)

Soldiers Personal Illuminator (SAUS)

Solid Propellant Information

Sonic Pulse-Echo Instrument (SAUS)

Southern Police Institute (SAUS)

South Pacific Island Airways, Inc. - ICAO designator (FAAC)

Soy Protein Isolate - Food technology

Spanish Paprika Institute (EA)

Spark Plug-Injector - Automotive engines

Special Education-Physically and Otherwise Impaired (SAUS)

Specialist, Punched Card Accounting Machine Operator - Navy rating

Special Position Identification

Specific Polarization Index (SAUS)

Specific Productivity Index (IEEE)

Spectrophotometric Process Ink (DGA)

Spider - NCIC car model code

SPI Holdings, Inc. - Later, SpectraVision, Inc. - AMEX symbol (SPSG)

SPI Pharmaceuticals, Inc. - AMEX symbol (COMM)

Spirit - NCIC car model code

Spirlet - NCIC firearms make code (NCIC)

Spitfire - NCIC car model code

Sports Philatelists International (EA)

Sports Promotion International (BUAC)

Springfield - Illinois - Airport symbol (OAG)

Springfield, IL - Amtrak rail station code

Standardized Precipitation Index

Standard Performance Indicator - Army

Standard Practice Instructions (MCD)

Standard Process Inc. (SAUS)

Standard Protective Item

Stateful Packet Inspection

Statement of Policy or Interpretation - Food and Drug Administration

Station Program Identification - Telecommunications (TEL)

Storage Protein Isolate - Food industry

St. Paul Island - Alaska - Seismograph station code, US Geological Survey - Closed (SEIS)

Strategic Perspectives, Inc. - Commercial firm

Strategic Planning Initiative - Environmental Protection Agency (GFGA)

Strategic Planning Institute - Cambridge, MA

Stroke Power Index (SAUS)

Strokes per Inch (SAUS)

Structure Probe, Inc. - Commercial firm

Stuttering Prediction Instruction - Speech and language therapy (DAVI)

Subsequent Protocol Identifier (TLAA)

Sun Position Indicator (IAA)

Superintendent of Public Instruction (DNAB)

Supervised Parallel Input (ACAE)

Supervisory Practices Inventory - Test

Surface Position Indicator (NASA)

Suspension & Parts Industries Ltd. (SAUS)

Swiss Performance Index (SAUS)

Symbolic Pictorial Indicator (MCD)

Synchronous Parallel Interface - Telecommunications (ACOL)

Synchronous Port Interface (SAUS)

Synergy Power Institute - Defunct (EA)

Synthetic Phase Isolation - Telemetry

Synthetic Phase Isolation (or Isolator) (SAUS)

System Performance Indicator

System Producibility Integration (SAUS)

System Programming Interface - Computer science

Systems Performance Interrogator (SAUS)

Spicules - Quality of the bottom - Nautical charts

Spinnage (SAUS)