LSI

LSI may mean

• Lake Superior and Ishpeming Railroad, a U.S. railroad offering service from Marquette, Michigan, to nearby locations in Michigan's Upper Peninsula
• Landing Ship, Infantry, a type of troopship or post WWII a landing craft used to convey a landing force (infantry and vehicles) from the sea to the shore during an amphibious assault
• Langelier Saturation Index, a measure for water's tendency to form chemical scale
• Large Scale Integration, electronic integrated circuits with tens of thousands of transistors per chip
• La Salle Institute, an all-male Private, Catholic, college preparatory school operated by the Brothers of the Christian Schools, enrolling young men in grades six through twelve in Troy, New York, USA
• Latent semantic indexing, another name for a technique in natural language processing normally called latent semantic analysis
• Logical Sensory Introvert, one of the sixteen Socionics types.
• Long string instrument, a musical instrument invented by the American composer Ellen Fullman
• "LSI (Love Sex Intelligence)", a single on the album Boss Drum by The Shamen
• LSI Corporation, a provider of silicon, systems and software technologies, formerly LSI Logic
• Sumburgh Airport (IATA airport code), the main airport serving Shetland in Scotland

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