TI-Nspire™ CX II-T Is Now Available!

[klesl]

Maybe the "T" letter desribes european version, similarly to TI-84 Plus CE and TI-84 Plus CE - T.
Citation from wiki:
In 2016, the TI-84 Plus CE-T was released for the European educational market. The only significant difference from the CE model is the addition of an LED that blinks while the calculator is in Press-to-Test mode.

https://en.wikipedia.org/wiki/TI-84_Plus..._Plus_CE-T