Confusion regarding component JUMPER-PAD-3-2OF3_NC_BY_TRACE
It isn't really a component at all. It's a solder jumper -- the component footprint forms three contacts, two of which are connected together by a trace. To change the jumper, it's possible to cut the trace between two of the contacts with a knife and drop a bit of solder on the other two to connect them.

The picture below shows what these look like on a circuit board. The two bits with the arrows pointing to them (ignore the instructions) are solder jumpers, with the top two contacts connected together by default.