[1] Service Provider Link
[2] Specialised Provision Link
[3] Set Priority Level
[4] Stored Procedure Language (Informix)
[5] Software Programming Language (->"IEEE Standard Dictionary")
[6] Split charging (CS-1 Service)
[7] Sound Pressure Level (->"NASA Acronym List")
[8] System Programming Language (->"NASA Acronym List") spl - set/switch priority level (http://www.ccil.org/jargon/jargon.html)