A while ago I was watching this video and the guy casually mentioned some woodworking marks that I found to be really great.
I was trying to search for more of these today and found out they are sometimes called witness marks, among other things (I've seen layout, carpenter's, woodworking, witness, datum, and other terms used inconsistently to refer to these marks or various subsets of them).
I am now trying to find more about traditional, well-established marking techniques and symbols. It seems that it can be a fairly personal thing, for example in this book and this video of a guy sharing his grandfather's marking techniques, they use triangles pointing away from you, while the guy in the first video above uses triangles pointing towards you. Still, despite the personal touches, they all generally seem to be variations of a common theme.
The only marks I've really been consistent with up to this point are triangles facing towards me for alignment and a double squiggly line for the face side of a reference edge, both from that first video. I'll also be using the tally marks on joints now (I was just using triangles for that, too), since I watched the chiselandforge video.
My question is: No matter what you want to call them, can somebody share their knowledge of a full set of these marks? The chiselandforge link above covers a fair set, but for some reason this seems to be an ancient woodworking secret mysteriously absent from the internet (well, I couldn't find much). I'd like to know more.
As a sub question, which is actually what I was looking for to begin with: I'm also wondering if there's a common marking used to indicate an original piece in a series of copies (e.g. if I want to do the same thing to many boards, and I do my accurate measuring on one then copy it to the others, is there a traditional mark to keep track of the original).