The meaning of the Acronym SPI is...

SPI is

• Security Parameter Index
• Subsequent Protocol Identifier
• SCSI-3 Parallel Interface
• Stateful Packet Inspection
• Statefull Packet Inspection
• Session Parameter Index

More Meanings For SPI:

• Soy Protein Isolate
• Slagging Pyrolysis Incinerator
• Serial Peripheral Interface
• Split Port Induction
• Semantics, Proof, and Implementation
• S Polynomial Information
• Self-Paced Instruction
• Store Payment Interface
• Staal Private Investigation
• Simulations Publications, Inc.
• Silverstein Properties, Inc.
• Singapore Paranormal Investigators
• Structure Probe, Inc.
• Scottish Power, PLC
• Superintendent of Public Instruction

SPI is also in:

• Accounting
• Botany
• Chemistry
• Electronics
• Firms
• Mathematics
• NYSE Symbols
• Positions
• Universities