I think you're describing the Ian Knot[1] or the Secure Ian Knot[2] I use the first for apron strings and draw strings, and the second for tying my shoes, and

I think you're describing the Ian Knot[1] or the Secure Ian Knot[2] I use the first for apron strings and draw strings, and the second for tying my shoes, and both knots are pretty much guaranteed to never come undone by themselves. The first one can be tied in like two seconds once you're used to it. And in fact, it may be just as "secure" as the more complex secure knot, so maybe I don't even need that one... [1]https://www.fieggen.com/shoelace/ianknot.htm https://www.fieggen.com/shoelace/ianknot.htm [2]https://www.fieggen.com/shoelace/secureknot.htm https://www.fieggen.com/shoelace/secureknot.htm