ZF8 question

What is meant by Turbine RPM for the ZF8?

I think it's basically the input shaft speed for the transmission, after the torque converter.

If the torque converter clutch is locked it will be very close to crankshaft RPM. If the clutch is unlocked it will be less than crankshaft RPM, all the way down to 0 if the car is in gear and not moving.

Thanks for the reply