A person's signature and the personal pronoun I  are representations of the self, self-image concepts condensed into a small but telling format.  The personal pronoun I indicates what the writer secretly thinks of himself and the signature is a conscious form of handwriting representing the writer's own idea of himself and how he hopes others will see him - it is the public self on view for all to see.  Often the signature will differ from the main body of writing.  When the signature is legible and shows no difference from the main body of writing, the writer will be a natural and nonself-conscious person who will behave alike in public and private.  Here are some variations between the signature and the styles of the script:  A signature smaller than the script indicates the writer is more modest than he demonstrates.  A signature larger than the script indicates a writer who wishes to be recognized as an important person.  A signature that slants left with a rightward slanting script indicates a reserve and restraint has been erected toward the public.  A signature that slants right with a vertical or leftward slant to the script indicates the writer is presenting a warm and out-going front to the world but is actually somewhat aloof and a private personality.  A vertical signature with upright or left inclined script indicates a writer who appears poised, in command of himself and often very charming in public.  Source: Hand Writing Analysis by Karen Amend & Mary S. Ruiz.