Technology:
* Internet Service Technology: A broad term encompassing the technologies used to provide internet access.
* Information Systems Technology: Refers to the technologies and practices used to manage and process information within an organization.
* Information Security Technology: Focuses on the technologies used to protect information systems and data from unauthorized access.
Other:
* In Situ Testing: Testing conducted in the actual environment where the equipment will be used.
* International Standard Time: Also known as Greenwich Mean Time (GMT), it's the time at the prime meridian, used as a reference point for time zones.
* International Society for Technology in Education: An organization dedicated to advancing the effective use of technology in education.
To determine the correct meaning of IST, you need more context. For example, the sentence "The IST team will be responsible for implementing the new security measures" implies that IST refers to Information Security Technology.