There is a spike connector in use currently and almost every electronic devIce you own has been connected by it.  Pogo pins are spring loaded contacts that are often pointed used to make temporary connections to circuit boards when testing them. The board will be loaded into a jig (often known as a bed of nails) that precisely aligns the pogo pins over the test points on the circuit and them pushes them down to make contact. The tester can then run through various tests either inserting or reading signals at the test points. A spike works well for both purpose as it can physically contact the circuit so you don't need a socket added at that point, the point often driven slightly beyond the surface contact point making a good connection and the long narrow shape makes it easier to avoid any components that may be around that spot. If you look at a circuit board you will often see round pads of exposed metal that are just in the middle of a trace seemingly doing nothing. If you look even closer you will often see dents or scratches where they've had a pogo pin attached in testing.  The probes on a multimeter are also typically spikes for this reason. Given that in most depictions of data spikes you see are unauthorized or unanticipated access then they are essentialy oversized test pins intercepting or injecting data/signals into a system.