Is this the 'Weaver's Knot'? I'm trying to remember a knot that I learnt in a crafts workshop to build a himmeli : a himmeli is a construction in straw (example image), a thread goes through the straw to keep it together. The knot I learnt was to join a new piece of thread, when you ran out of thread.
The knot I was taught was called &quot;Kankurin Solmu&quot; in Finnish (it translates to &quot;Weaver's Knot&quot;). I found the following diagram of the &quot;Weaver's Knot&quot; on this Finnish web page, but I just can't make out how it is built from the diagram.
Do you think that the knot in the photo I posted below corresponds to the so-called Weaver's Knot of the diagram at that page? (Something doesn't seem quite right to me but I can't exactly remember the knot I was taught and I can't really make out the diagram).
Does the knot in the photo of my post seem viable as a knot to join thread?

Click image for larger version
The knot on the web page you posted looks like a basic square knot (aka reef knot) to me, at least as far as the end result is concerned. (They're tying it upside-down for some reason, but they're ending up with two simple overhand knots, one right, one left, and that's gonna get you a square knot.) One of the square knot's main uses is to join two pieces of thread/yarn/string/rope, so it can certainly be used to tie in a new piece of thread while weaving.
What you're tying looks like maybe a strange configuration of a granny knot, which is not likely to stay put if you pull on the ends.
An actual &quot;weaver's knot&quot; does exist, but doesn't look like either your image or the website you linked to. It's also called a sheet bend, if that helps.