The acronym GSI can refer to several different things, depending on the context. Here are some possible meanings:

• Gross Sexual Imposition: This is a serious felony charge in the state of Ohio, which involves the nonconsensual sexual contact of another persons erogenous zones.
• Generic System Image: This is a pure Android implementation with unmodified Android Open Source Project (AOSP) code, runnable on a variety of Android devices. App developers can install and run the latest Android GSIs to perform app testing on a variety of existing Android devices and using GSIs from different Android OS release stages, including Developer Preview and Beta builds.
• Global System Integrator: This refers to a type of partner that provides integrated consulting, outsourcing, and managed services across the globe, with a commitment to helping customers protect their people, data, and brand. GSI partners work with companies like Proofpoint to deliver customized, integrated, and fully managed security solutions for customers.
• Gemological Science International: This is a commercial laboratory that provides gemstone identification, grading, and appraisal services in the fine jewelry industry. GSI primarily grades diamonds for large chain stores, and their service is usually speedy. However, their grading is generally considered to be looser than the gold standards (GIA lab), and weaker than the next level down (IGI and HRD) .
• Other possible meanings of GSI include Geological Strength Index, Gonadosomatic Index, UK Government Secure Intranet, Grid Security Infrastructure, Geospatial Information Authority of Japan, Geological Survey of India, Geological Survey of Ireland, Global Security Initiative, Graduate Student Instructor, and Grand-Santi Airport.

Without more context, it is impossible to determine which of these meanings of GSI is the correct one.