A signature by one person expressed to be on behalf of another,
derived from the Latin "procurare" - to take care of. The phrase
"per procurationem" (through the agency of) was originally used
before the agent's signature and became abbreviated to "p.p" or
more commonly these days "per". Thus: [signature reading Arthur
Able] Arthur Able per Cameron Cain is a signature by procuration.
Since Cameron Cain signed it, not Arthur Able, it may not look
anything like Arthur Able's signature but it is intended to be
treated as Arthur Able's signature, if Cameron Cain was acting
within his authority. A signature by procuration on a negotiable
instrument operates as notice that the person signing has limited
authority and can only bind the principal to the extent of that
authority.