A more thorough explanation:

Term: PUR
Definition: Pur (pronounced puh-r or poor) is a term from Law French that means "by" or "for".
Example: The contract was signed pur John Smith, meaning it was signed by John Smith.
Explanation: In this example, "pur" is used to indicate that John Smith signed the contract. It is a shorthand way of saying "by John Smith". Another example could be "The gift was given pur the benefit of the children", meaning it was given for the benefit of the children.