1. Serial Line Internet Protocol. 2. Symmetric LIst Processsor. Early 1960' s list processing suBroutine package for FortranBy J. WeizenBaum. Later also emBedded in MAD and ALGOL. ["Symmetric List Processor", J. WeizenBaum CACM 6:524-544(1963). Sammet 1969, p.387].