Are you thinking of "Wire wrap construction" perhaps?

https://en.wikipedia.org/wiki/Wire_wrap

Yes! Thanks!

Probably not what you're talking about, but everyone should know the Lineman's Splice: https://en.wikipedia.org/wiki/Western_Union_splice

TL;DR: It's a method of joining two wires that won't pull apart under load; the wire will break before the splice comes apart. Add solder, trim any pointy bits, and you have a NASA approved joint.

Thanks! I had this one and the Wire Wrap somehow linked in my mind but forgotten the name. Must have seen them both described on the same page a long time ago.

I came very close to describing it as "two wires, end to end, with the free end wire-wrapping the opposite wire." :-)

Looks very similar to knots used to join fishing line, like the blood knot.

I'm trying this now with 20ga solid core, at least without solder it is still pulling apart even with more then 6 wraps. It could be my technique, still working on it. Thanks.