1) Военный термин: Improved Target Acquisition System, improved tactical attack system, integrated target acquisition system
2) Сокращение: Improved / Integrated Target Acquisition System, Improved TOW Acquisition Sight, Improved Tracking Adjunct System
3) Должность: Information Technology Applications Specialist
4) НАСА: Integrated Telescope Automation System
Универсальный англо-русский словарь. Академик.ру. 2011.