\signature ¶Synopsis:
\signature{first line \\
... }
The sender’s name. This command is optional, although its inclusion is usual.
The argument text appears at the end of the letter, after the closing.
LaTeX leaves some vertical space for a handwritten
signature. Separate multiple lines with a double
backslash, \\. For example:
\signature{J Fred Muggs \\
White House}
LaTeX’s default for the vertical space from the \closing text
down to the \signature text is 6\medskipamount, which is
six times \medskipamount (where \medskipamount is equal to
a \parskip, which in turn is defined by default here to
0.7em).
This command is usually in the preamble, to apply to all the letters in
the document. To have it apply to one letter only, put it inside a
letter environment and before the \closing.
You can include a graphic in the signature as here.
\signature{\vspace{-6\medskipamount}\includegraphics{sig.png}\\
My name}
For this you must put \usepackage{graphicx} in the preamble
(see Graphics).