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:

• SCSI Parallel Interface
• Serial Peripheral Interconnect
• Standard Performance Indicator
• Single Process Initiative
• SCSI Parallel Interface
• Serial Port Interrupt
• Serial Port Interface
• Synchronous Parallel Interface
• Security Parameter Index
• Subsequent Protocol Identifier
• SCSI-3 Parallel Interface
• Stateful Packet Inspection
• Statefull Packet Inspection
• Session Parameter Index
• Security Parameters Index

SPI is also in:

• Drivers
• General
• Hardware
• Networking
• Security