What does OPI stand for?

Oculoparalytic Illusion - Ophthalmology

Office of Planning and Integration (ABAC)

Office of Primary Interest

Office of Programs Integration - Energy Research and Development Administration

Office of Protective Intelligence (SAUS)

Office of Public Information - UNESCO

Office of Public Inquiry (SAUS)

Off-Site Production Inspection (AAG)

Ogden Projects (SAUS)

Oil Patch Group, Inc. - Toronto Stock Exchange symbol

Oil Pressure Indicator

Omnibus Personality Inventory - Psychology

One Person's Impact - An association (EA)

Open for Public Inspection - Patent applications

Open Information Interchange (SAUS)

Open Prepress Interface - Computer science

Open Prepress Standard (SAUS)

Open Protocol Interface - Telecommunications

Operator Interface (SAUS)

Opinion Research Corp. - AMEX symbol (NASQ)

Optical Publishing, Inc. - Information service or system (IID)

Orbital Position Indicator

Orbiter Payload Interface (ACAE)

Orbiter Payload Interrogator - NASA (MCD)

Ordnance Procedure Instrumentations (AAG)

Ordnance Procurement Instructions - Army

Organizational Productivity Institute, Inc. - Commercial firm

Organophosphate Insecticide

Orthostatic Pooling Index

Other Party Identifier (SAUS)

Output Productivity Index

Outside Procurement - or Purchase Inspection (AAG)

Outside Production Inspection (SAUS)

Outside Purchase Inspection (SAUS)

Overall Performance Index - Finance

Picton Public Library, Ontario - Library symbol - National Library of Canada (NLC)