Trey The Explainer on YouTube has a great video about “the rarest signature”, which is more like a deep dive on to what exactly is a signature and autograph (and…why)
genewitch 3 days ago [-]
Is it more complex than "mark one puts upon something to signify that they put a mark on it?" and "the same except the 'something' belongs to another person"?
https://en.wikipedia.org/wiki/Seal_(emblem)