In the first version of the RPi, I think just a pin to + 5v, another for + 3.3V and one for GND. And people are plenty remain unused.
Katika toleo la kwanza la RPi ya, nadhani Bana kwenye + 5v tu ndiye, mwingine kwa + 3.3V na moja kwa GND. Na watu mengi kubaki zisizotumika.