Max Pulver is the author of three graphology books (1931,1934 and 1949) and several articles. He developed the theory of symbolism of space. His work discusses pressure, intelligence and crime. He founded the Schweizerische Graphologische Gesellschaft (Swiss Graphological Society) in 1950 and was president until his death.
Major symbolism starts with the point, and examines where and how it travels, to derive an understanding of the personality. This travel is not restricted to strokes. It can be equally applied to white space within a page, or the page as a whole.
This looks at the stroke structures, or sequence of stroke structures, reflecting upon what they are symbols of.
Within this context, a strong leftward moving stroke through a signature would be symbolic of removing one's self from life. How that removal is manifest, depends upon what else is in the handwriting.
Pulver, Max Albert Eugene (1944). "Die charakterologische Bedeutung der Schriftfärbung" (1st ed.). Berne: Huber.