A burl.
gnarl
burl
Burr.
Another name for the Hercules knot is the square knot.
gnarl
Noose
knar, also knur
Another name i have heard it called was " the knot" and "the bulge".
Yes, it is called a burl.
curl
The meaning of gnarl when referring to a tree is the knot protruding from a tree. This can be memorized easily by remembering that gnarl mainly means knot.
gnarl