what does "TSI" stand for?

[vick]

Some say its, turbo system intercooled, turbo sport intercooled, turbo satified injection, turbo system injection, what is it actualy?

[LHZAWD]

thats a good one
tuned sequential injection...i always thought
but could be turbo sport intercooled according to some sites
or turbo sport injection
the esi - eagle sport injected or economy sport injected

didn't eagle vision have a tsi -so it can't mean turbo