SP

From AFSWiki

Abbreviation for Sponsored Programs

Much less common, but in some contexts it could also mean "School Placed." School Placed is similar to Community Placed except that a specific school has reviewed the student application and told AFS that if a suitable family is identified, the school will accept the student. It is most typically used for private schools that waive tuition or schools with very specific requirements for exchange students, such as a school for the deaf or school for the blind.