Is there an umbrella term for surface laptops?

I have in mind to buy a laptop / tablet and unfortunately I do not know what to look for. Model was the Microsoft Surface but that's just too expensive for me. Since I have a good PC that I normally work on, the tablet does not have to be able to do too much. It serves purely for the university.

The "laptop" should

have a touch surface
I would like to be able to write on it with a pen, for example in scripts. Write something or mark with marker
A keyboard (for extra connect possibly)
It should be able to run programs like BlueJ and Matlab on it
about 14 inches

I do not know if there's a special term for the type of touch device with pen function which still has laptop functions? Maybe someone can help me with this description? Would be very happy about suggestions which devices would be suitable. (Up to 500 euro would be good, I can't spend more unfortunately)

These are convertible laptops

Thanks alot!