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.

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.

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.