Networking
- Science, technology, and mathematics
- Inappropriate sinus tachycardia, an uncommon type of cardiac arrhythmia
- Information Society Technologies
- Information systems and technology
- Insulin shock therapy, a form of psychiatric treatment
- Inverse scattering transform, a method for solving some non-linear partial differential equations
.ist, the file extension for files created by the now-obsolete Adobe ImageStyler
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- Set theory
- Internal set theory, an axiomatic basis for part of non-standard analysis
- Intuitionistic set theory
- Intuitive set theory
Read more about this topic: Ist