Strange... "Nbdev is a system for something that we call exploratory programming." but no citation... the phrasing suggests this is something they believe they've come up with a name for?
I coined the term - and it turns out someone else did too, for something else. So be it. If someone else can think of a better term that's never been used before, then I'll happily use that instead.
The earlier usage mentioned in Wikipedia is entirely uncited there however, and seems to have only been used in one academic project AFAICT.
"In some cases the estimates may be obvious. Perhaps the story is similar to others that have already been completed. In other cases the story may be very difficult to estimate and may require exploratory programming."
In electronics, we call it Breadboarding, and the results are expected to be temporary by all involved. Breadboarded circuits generally are not stable over time or movement.