you mean like the thinkpad trackpoint?
I assume they mean an actual roller ball (like https://en.wikipedia.org/wiki/Compaq_Contura )
It is still a crazy question though because if you seen most laptops in the last 15 years there is basically no room for them except on the large workstation thinkpads or large gaming laptops.
Not the OP, but some older laptop designs had a small trackball where modern machines have a touchpad, e.g. the early PowerBooks[1]
1: https://en.wikipedia.org/wiki/PowerBook_180
I assume they mean an actual roller ball (like https://en.wikipedia.org/wiki/Compaq_Contura )
It is still a crazy question though because if you seen most laptops in the last 15 years there is basically no room for them except on the large workstation thinkpads or large gaming laptops.