TSI
TSI stands for:
- TSI (engine technology) , Twincharged Stratified Injection or Turbocharged Stratified Injection , a special engine technology,
- Technical specifications for interoperability , EU railway regulations
- Televisione Svizzera Italiana , see Radiotelevisione svizzera di lingua italiana , an Italian-speaking Swiss television broadcaster
- TETRA Subscriber Identity , the address of a terminal in terrestrial trunked radio
- True Sale International , a company promoting the German securitization market
- T-Systems International , a subsidiary of Deutsche Telekom
- Trusted Site Infrastructure , a certification mark from TÜV Informationstechnik GmbH for a reliable IT infrastructure
tsi stands for:
- Tsimshian (language) (ISO-639-2 code), Penuti language of the Tsimshians in northwest British Columbia and southeast Alaska, see Tsimshian # language
