What does PI stand for?

Personal Investigator (less common)

This definition appears very rarely

Other Resources:

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Performance Insight (Oracle) Perimeter Institute for Theoretical Physics Periodic Inspection Peripheral Iridotomy Perlite Institute (Staten Island, NY) Perpetual Inventory Persistently Infected Personal Identifier Personal Injury (legal) Personal Inspection		Petroleum Institute Phase I (clinical studies) Philadelphia Inquirer (newspaper) Philippine Islands (slang) Phosphate (Inorganic) Phosphorus Index Photo Interpretation Photo Interpreter PhotoImpact (digital imaging software) Physical Inventory

Samples in periodicals archive:

So, instead of taking the risk of losing millions of dollars by hiring the wring person, why not invest a little in getting a personal investigator or investigation firm to do the background check of all your potential employees?

The Importance of Doing a Background Check of Potential Employees

Set in 1942 Algeria, when the Allies are on the brink of liberating the nation from the grip of the Vichy French regime, Irish-American ex-cop and personal investigator of General Dwight D.

The First Wave

By this service, you do not need to hire personal investigators to look for the person you are looking for.

Free Online People Search A Priceless Convenience