Acronyms - what do they all mean?

I thought I’d start this thread to help others like me have a resource for what all these acronyms and short hand being used stand for. Once we get quite a few, I’ll alphabetize and re-post as resource so others can have an easier time. Also, I think D17 is daughter with high school graduation of 2017. S18 is son with high school graduation 2018. Did I get that right?

OOS - out of state
LAC - Liberal Arts College
hs - high school

MODERATOR’S NOTE:
Thread already exists. Feel free to join the discussion there. Closing this one.
http://talk.collegeconfidential.com/parents-forum/52585-abbreviation-thread-p1.html