English translation: Por Delegación / By Delegation
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Explanation: When you sign on behalf of somebody else, the Latin term or its equivalent abbreviation is used.
The word is applied to the authority or power delegated to a procurator, or agent, as well as to the exercise of such authority expressed frequently by procuration (per procurationem), or shortly per pro., or simply p.p. http://en.wikipedia.org/wiki/Procuration