Interconnects, some have directional indicators, why?

Yes, with a RCA cable, the shield may be connected to ground at one end (at source). An arrow or markings will indicate the proper direction.

I have read that George Cardas winds the copper strands in a particular way that makes the signal flow directional. Meaning that the cable sounds better in this direction.
But I was taught that in theory, wire is not directional.

I mark the oen's I build, but as noted, it's due to shielding.

Best,

Erik

I'm just guessing here, but I imagine it also may have something to do with the magnetic fields which are created anytime current moves (right hand rule) down a conductor.  I imagine that the geometry of the conductors are used to manipulate this in some way that they feel impacts the signal the least.

Then again it could be pure snake oil, but I doubt it.

The problem is that wire is directional. All wire, wire in fuses, wire in interconnects, speaker cables, internal wiring in electronics and speakers, the wire in capacitors. That's why interconnects that are not shielded sometimes have arrow, you know like Anti Cables and others. So, here's the real problem, those cables and interconnects that are shielded and have arrows to indictate the direction the cable should be connected because of the shield may or may not consider the direction of the wire itself. It doesn't take a rocket scientist to figure out the wire in shielded cable should also be considered when marking the cables for direction with arrows. The sound would suffer somewhat if the wire itself was in the wrong direction even shield was in the right direction.