SPI

SPI stands for:

Security Parameter Index, a unique identifier of a Security Association with IPsec
Serial Peripheral Interface, a system developed by Motorola serial bus system
Service Provider Interface, programming interface for implementations of standardized interfaces
Serviço de Proteção ao Índio, see Fundação Nacional do Índio
Simulations Publications, a former American toy manufacturer
Single Point Injection, see fuel injection
Software in the Public Interest, a non-profit organization for the promotion of free and open source software
Software Process Improvement, procedures and methods for the continuous improvement of software development processes
Social Pedagogical Institute Berlin, charitable foundation in the stable of the AWO ( education and training, counseling, youth welfare, Diversion, research, urban development )
Social Pedagogical Institute NRW, developed and tested to work in day care centers for children, such as kindergartens or day care centers
Stateful Packet Inspection Firewall with a
Sustainable Process Index, an instrument for assessing the environmental sustainability of processes
Swiss Performance Index, total market index for the Swiss stock market

SPI as a distinguishing mark on license plate:

Spi stands for:

S.P.I. stands for:

Sisters of Perpetual Indulgence, a worldwide operating AIDS prevention organization