Acronyms, Abbreviations, and Initialisms.
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The meaning of the Acronym SIS is...

SIS is

Seti Intercept System
Single Image Stereogram
Soy Integrative Support
Small Inducible Secreted
Student Information Systems
Shimano Index System
Student Information Services
Silicone Integrated Systems
A Stud In Spandex
Shimano Integration System
Security Industry Specialists
Styrene Isoprene Styrene
Symbian Installation System
Self Injury Songs
Singcare International Services
Sunne In Splendour
Special Intelligence Service
Satellite Information Systems
Social Impact Statement
Single Instance Store
Scanscope Image Set
Springtime In Sweden
Substratum Intake System
Surabaya International School
Sara In Sweden
Short Interval Scheduling
Species Information Service
Sales Information System
Social Insurance Substitute

More Meanings For SIS:

Simple Instruction Set
Psion Software Installation file
Saws Information System
Spectrum Internet Suite
Shimano Index Shifting
Sister
Superconductor Insulator Superconductor
Safety Instrumented System
Science Information Systems
Student Information System
Sean Is Stupid
Stupid Impossible Scenarios
Short-Interval Schedular
Seti Intercept System
Single Image Stereogram

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