A guitar pedalboard is a container for electric guitar
effects pedals and their
power supplies. The pedalboard comes in many different forms and shapes and many guitar players make their own. In general, it has a flat surface where pedals and their power supplies are attached using Velcro or some other adhesive substance. Fig. 1 shows a custom-made pedalboard with a power supply attached at the bottom.
See more at Wikipedia.org...