These are headers for the Sleepy Pi 2 Blanket system. They are used to transfer the Blanket expansion signals between boards in a stack. This can be done in two ways:
- “Standard” way with headers that effectively terminate on the board that is the end if the stack.
- Stacking way which enables the signals to pass on to the next board up in the stack.
The “Deluxe” option includes all the headers to keep your options open.