When you use “p.p.,” it indicates that you are signing the letter under the authority given to you by the person you are representing.

You put "p.p." in front of the name of the person for whom you are writing the letter -- p.p. stands for "per pro" (for and on behalf of).

Above his typed name, sign your own name, preceded by the letters p.p. This stands for the Latin term "per procurationem," often abbreviated in discussions as "per pro." This phrase means you have been granted the power to sign on another person's behalf, in this case, your boss.