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VSI may stand for:

  • Vertical shaft impactor, a type of impact crusher
  • Vertical speed indicator, an instrument in an aircraft monitoring rate of descent or climb
  • Very Short Introductions, a series of books published by Oxford University Press
  • Virtual Switching Instance, in VPLS
  • Voluntary Service International, the Irish branch of Service Civil International
  • VMS Software Inc. A vendor/supporter of OpenVMS related software.