| SPI | the amount that has spilled |
|---|---|
| SPI | United States writer of popular detective novels (born in 1918) |
| SPI | a long fishing line with many shorter lines and hooks attached to it (usually suspended between buoys) |
| SPI | an attacker who sheds or spills blood |
| SPI | a thin strip of wood used in playing the game of jackstraws |
| SPI | a game in which players try to pick each jackstraw (or spillikin) off of a pile without moving any of the others |
| SPI | (economics) any indirect effect of public expenditure |
| SPI | a channel that carries excess water over or around a dam or other obstruction |
| SPI | a genus of Mustelidae |
| SPI | small skunk with a marbled black and white coat |
| SPI | rapid descent of an aircraft in a steep spiral spin |
| SPI | the act of rotating rapidly |