[1] Standard Product Interface - Netzwerk(entwicklungs)standard, ähnliche ISODE
[2] Service Provider Interface
[3] SCSI Parallel Interface
[4] Serial Peripheral Interface
[5] Self-Paced Instruction (->"IEEE Standard Dictionary")
[6] Site Population Index (->"IEEE Standard Dictionary")
[7] Surface Position Indicator (->"NASA Acronym List")
[8] Springfield, IL, USA -internationale Fughafen-Kennung