The title says "TI Nspire CX II CAS", the picture says "TI Nspire CX II-T CAS", which one is it? According to Wikipedia, they have different functionalities. And does anyone understand why they need such cryptic designations, no one understands that...

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It is a: TI-Nspire cx II-T CAS 
As far as I know, there is only the TI Nspire CX II-T CAS or the TI-Nspire CX II-T. The T is therefore always present. Perhaps you mean the TI Nspire CX CAS or the TI Nspire CX. These would be the predecessor models, which are no longer sold.
Source: TI-Nspire website

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Question about TI Nspire CX II-T CAS

The title says "TI Nspire CX II CAS", the picture says "TI Nspire CX II-T CAS", which one is it? According to Wikipedia, they have different functionalities. And does anyone understand why they need such cryptic designations, no one understands that...