The meaning of the Acronym PI is...

PI is

• Principal Investigator
• Program Introduction
• Procurement Item
• Preliminary Investigation
• Pen and Ink (Document Update)
• Payload Interrogator

More Meanings For PI:

• Processing Instruction
• Pages In
• Power Intelligence
• Priority Inherit
• Process Information
• Pocket Informant
• Processor Interface
• Packet Interface
• Parity Inner
• Platform Independent
• Protocol Interpreter
• Presence Information
• Path Identifier
• Personal Information
• Programming Interface

PI is also in:

• Assembly
• General
• Hardware
• Networking
• Security
• Software