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The Ni means it is used for NiChrome wire coils (Nickel).
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There are a lot of Temperature wires, but the major ones are Stainless, Titanium, and NiChrome.
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A quick correction...
NiChrome and Nickel are not the same thing... not even close.
It would be bad for someone to buy and attempt to TC their NiCr in NiTC mode and get frustrated when it doesn't work (it won't hurt anything, but even Kanger has issues getting their NiCrTC to work, and I'm not even sure about the HohmWrecker... it's just too low of a TCR).
Would you be good enough to go back and edit the NiChrome out of your post?
Good post otherwise.