None identical, but trained handwriting analysts can find distinct similarities that are common in your hand writing style.
I don’t think it’s hooey but I do think it’s something that people get training to do accurately, along with other forensic techniques. Just reading a book on the subject doesn’t make you a handwriting analyst.
Other than the times I print the capital letters of my first and and last name my signature looks the same.
I think your thread title and your poll are essentially unrelated. I don’t think anybody that analyzes signatures thinks it works because signatures are identical.
I also think I can recognize a few people’s handwriting, and I’ve never even tried to be a handwriting analyst. I think there is something there about the handwriting I can exploit to identify the writer. I expect that if I made a systematic study of the subject, I’d be able to identify and to some degree quantify a number of things to exploit and so improve the process. Do you doubt this?
I once read an article about of documents concerning the Roswell UFO incident that had been released by US authorities. An investigator had managed to find a 100% match between a signature by Harry S Truman in that material and a signature on another document. The conclusion he drew was that it could be nothing but a photocopy and therefore fake.
I said 2 times. I noticed quite some time ago that my own signatures are far from consistent. There’s dozens of essentially random factors that influence what my signature will look like: how tired I am, how much of a hurry I’m in, how large or small the signature space is, how good the writing instrument is (if the pen is crappy/nearly dead, I might feel compelled to go back and “retouch” my signature), etc., etc.