Dell Latitude E7250 12" 256GB Ultrabook

Does this have a thinkpad style pointing nub in the middle of the keyboard?

I don’t see one in the photo but it says the keyboard has a single pointing, whatever that means.

No nub. Single Pointing just means that it only has one mouse-input source (touchpad) built-in. Otherwise, if it was Dual Pointing, it would have both the touchpad and the nub, with buttons for both.