1. Telemarketer Training Institute, Inc., a leading provider of sales training.
2. Trauma Treatment International, a private practice offering training services for trauma treatments.
3. Total Transit, Inc, one of the largest providers of bus transportation for students & adults with disabilities as well as general public & charter customers based in Texas.
4. Texas Tech University Independent School District's designation for Tech Teach Independent (TTI).
5. Training Transfer Incentive: an incentive system utilized on a company scale based on training transfer metrics.
The context will typically make it clear which definition of TTI is being used.