Integrated Student Information System
Institute for Science & International Security
Institute for Software Integrated Systems
Interactive Spectral Interpretation System
Integrated Software for Imagers and Spectrometers
Institution for Secularization of Islamic Society
International Society for Infant Studies
Information Science and Information Studies
Innovative Solutions in Space
Integrated Scientific Information System
Institute for Simulation and Interprofessional Studies.
internet Sexuality Information Service
are some of them.
Islamic State of Iraq and the Levant
Islamic State in Iraq and Syria.
In the cartoon Archer, it stands for International Secret Intelligence Service.
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