Comment by nwah1

open hardware to me means that you have access to all of the specifications for building the hardware. Things like when the laptop company Framework posts github repos full of CAD models. Or, initiatives like RISC V.

And, alongside that, there's also open firmware.

Unlocked hardware is maybe what I would call hardware that enables swapping out the software. Although, historically, we didn't even need a term for that, because that was the default aside from outliers like Apple.