RSI may refer to:

Broadcasting services

  • Radio Singapore International, a former radio broadcaster in Singapore
  • Radio Slovenia International, the international service of Slovenian state radio
  • Radiotelevisione svizzera di lingua italiana, a Swiss radio and television broadcaster

Computing

  • RSI register, a 64-bit processor register of x86 CPUs
  • Recursive self-improvement, a concept in artificial intelligence
  • Reference Software International, a defunct productivity software developer
  • Relational Semantics, Inc., an American software company

Finance

  • Relative strength index, a technical indicator used in the analysis of financial markets
  • Revenue and Social Insurance number, an identifier used for tax and welfare purposes in Ireland

Medicine and psychology

  • Rapid sequence induction, a method of emergency intubation, involving paralytics and sedation
  • Repetitive strain injury, a disorder affecting muscles, tendons and nerves from repetitive movements, forceful exertions, vibrations, mechanical compression, or sustained/awkward positions
  • Residual self image, the concept that individuals tend to think of themselves as projecting a certain physical appearance
  • The Real, The Symbolic, and The Imaginary, a theory in Lacanian psychoanalysis concerning human perception of reality
  • Retained surgical instruments, surgical tools or materials inadvertently left inside a patient's body

Physics

  • RSI-value, a measure of how well a two-dimensional barrier resists the conductive flow of heat
  • Review of Scientific Instruments, a scientific journal

Other organisations

  • RSI Corporation, an American safety compliance consulting firm
  • RADARSAT International, a provider of data and information derived from the Canadian RADARSAT satellite program overseen
  • Red Sport International, an international sports organization supported by the Communist International
  • Research Science Institute, an international summer research program for high school students
  • Religious Science International, a religious organization

Other uses

  • Ṛṣi, a term for an accomplished and enlightened person in Hinduism and Buddhism
  • Red Sea International Airport in Saudi Arabia
  • Regional snowfall index, a system used to assess the impact of winter storms in the United States
  • Italian Social Republic or Repubblica Sociale Italiana, a puppet state of Nazi Germany during the later part of World War II