What does SI stand for?

What does SI mean?

SI	Substitution Instance Miscellaneous » Food
SI	Slow Import Computing » Networking
SI	Sarekat Islam International » Indonesian
SI	Small Interface Miscellaneous » Unclassified
SI	Slight Inclusion Miscellaneous » Unclassified
SI	Semi Iterative Computing » General
SI	Self Inserted Medical » Physiology
SI	Speech/Language Impairment Community » Educational
SI	Stochastic Interest Miscellaneous » Unclassified
SI	Selectable Interface Computing » Networking
SI	Super Insulation Miscellaneous » Unclassified
SI	Stockmarket Indices Business » Stock Exchange
SI	Sexually Inactive Miscellaneous » Unclassified
SI	Silcon Investor Miscellaneous » Unclassified
SI	Sport Injected Miscellaneous » Unclassified
SI	Sports Injection Miscellaneous » Unclassified
SI	Systems Integral Miscellaneous » Unclassified
SI	ACM Government Spectrum Fund, Inc. Business » NYSE Symbols
SI	Seller Identification Business » General
SI	Soft Intermediate Miscellaneous » Unclassified
SI	Sensory Imagery Miscellaneous » Unclassified
SI	Sports Injected Miscellaneous » Unclassified
SI	Sport Influenced Community » Sports
SI	Self Indulgance Miscellaneous » Unclassified
SI	Sub Inspecter Governmental » Police