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What does S/I stand for?

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Rank Abbr.Meaning
SISystem Information
SISystem Information (Norton Utilities)
SIStatutory Instrument (UK Legislation term)
SISlovenia (international code)
SiSilicon
SIService Information
SISchool of Information (university)
SISelf-Injury
SISquare Inch(es)
SISmithsonian Institution
SISupplemental Instruction
SISignal Integrity
SISpark Ignition
SIShift In
SISlightly Included (second lowest quality of diamond)
SISerious Injury
SIStaten Island
SISistema Informativo
SISystèmes d'Information
SIStandardization (Flight) Instructor
SISystem International
SISite Investigation
SISensory Integration
SISexual Intercourse
SISystem Interface
SIStill Image
SIShut-In
SISmall Intestine
SISeriously Ill
SISelf Inflicted
SIScientific Investigation
SISistema de Informação
SISacroiliac
SISingapore Idol (Singapore TV show)
SISoftware Item
SISimply Irresistible (song)
SISpeaker Independent
SIScience and Industry
SISacroiliac Joint
SISiena, Toscana (Italian province)
SISite Inspection
SISystème International d'Unités (international system of units based on the Meter, Kilogram, Second, Ampere, Kelvin, Candela, and Mole)
SISwap-In
SISoroptimist International
SISub Inspector
SISimple Interest
SISynergos Institute (San Diego, CA)
SISoftice (debugger)
SIService Index
SISwarm Intelligence
SISudden Impact (movie)
SISource Index
SISuicidal Ideation
SIScientific Instrument
SIStep-Index
SIService Indicator (SS7 SCCP)
SISituationist International (governing body of political dissidents circa 1968)
SISPARC International, Inc.
SISemiconductor International
SIShared Interest (New York, NY)
SISide Information
SISpecial Instruction
SISchweizer Informatiker Gesellschaft (Zurich, Switzerland)
SIShrouded Isles (gaming, Dark Age of Camelot add-on)
SISilicon Image, Inc
SISpecific Impulse (measure of efficiency of rocket engines)
SISurface Impoundment
SISpecial Intelligence
SISpecial Inspection
SISaturation Index
SISignal Interference
SIScience Instrument (Hubble Telescope)
SISoil Investigation
SISimilarity Index
SIStrategic Investor
SISpeech Impairment
SIShift-Invariant
SISalt Institute
SISolution Implementation
SISummons Issued
SISarcasm Intended
SISystematic Innovation
SISailing Instruction
S/ISignal to Interference Ratio
SISecurity Inspector
SISolving International
SIStrange Interlude (Eugene O'Neill book)
SISensitivity Information
SISelf-Insertion (fan fiction)
SIShipping Instruction
SISiilinjärvi (Finnish)
SISexually Inappropriate
SISecondary Injection
SISolar Influences
S/IShipping Instruction
SIScalable Infrastructure
S/ISubject Issue
SISkill Identifier (US Army)
SISucrase-Isomaltase Deficiency
SISettlement Instruction
S/ISimultaneous Interpreting
SISurveillance and Intelligence
S/ISuperior to Inferior
SISelf Isolation
SISafeguards Information
SISafe Intake
SIStandardization and Interoperability
SISpiritual Intervention (religious doctrine)
SISurveillance Index
SIStraight-In Approach
SISpray Injection
SISergeant Instructor
SISaint Ignatius College Preparatory (San Francisco, California)
SISmoothness Index
SISociety for India (Cornell University)
SISummary Investigation
SIScintillation Index
SISupporting Installation
SISamahang Ilokano (Filipino college organization)
SISolar Inertial
SISupplementary Insulation
SISponsor Identification
SISport Injected (Honda)
SISurveyor Intern
SISimple Interference
SISector Iridectomy (partial removal of the iris of the eye)
SISeptuagint Institute (Trinity Western University, Canada)
SISelective Interchange
SISafety/Site Inspection
SISemiconductor Ignition
SIShadow Instruction (computer instruction set)
SISharma Industries
SISomatosensory Receiving Area (in parietal lobe of cortex)
SISpokane International Railroad Company
SISignaling Intelligence
SiNormalized Subthreshold Swing
SISippy International
SISlave Illuminator
SISystems Industries, Incorporated
SISocietatis Iesu, Latin for Society of Jesus, Jesuits (religious order)
SISecretaría Indigenista (Spanish: Indigenous Secertariat)
SISelf-Incompatibility (botany)
SISelf-Insert (fiction)
SIInternational System of Units (metric system; more commonly seen as ISU)
SIShadow Image
SISensitive Item (algorithm)
SIService Integrator
SISouth Island (New Zealand)
SISuperimpose
SIStructural Integrity
SIStudy Island (software)
SISports Illustrated
SISports Interactive (game)
SISpecialty Item
SIStrategic Initiative (management)
SISystems Integration
SISystems Integrator
SISystems Intelligence (psychological theory)
SISwine Influenza
SISystem Integrator

Note: We have 92 other definitions for S/I in our Acronym Attic