The letters "p.p." preceding a signature stand for "per procurationem" when signing on behalf of someone else. The phrase, derived from Latin word "procurare," means "to take care of." The inclusion of "p.p." on the signature line alerts the reader that the document has been signed by proxy.
According to The Law Dictionary, a common legal solution for signing on behalf of an individual who is unable to manage his or her own affairs is the appointment of power of attorney. Once the necessary legal documents have been prepared and signed, the appointed individual has the right to sign all legally binding documents on behalf of the person for whom they hold power of attorney.