There is so much in it, I just skimmed through all the pages. There is some neat stuff in there. Mostly weirdness... I love seeing these
Note that this "home" page is an overview on proposed meanings of signal indications. It expands much more in "A Few Particulars" (section 3 on this page).
http://home.comcast.net/~tamivox/dave/t ... index.html
EDIT (unrelated):
Spoiler: