Here's some of the curriculm abbreviations you'll see:
MOH...Mystery of History
CGC...Considering God's Creation
FIAR...Five in a Row
LLATL...Learning Language Arts Through Literature
STOW...Story of the World
WTM...The Well-Trained Mind
Those are the ones you see most often on this board. There might be a few others, but usually we will mention it by the title first time and then use its abreviation.
Oh, I have also refered to my DSS...Dear (or DARNED!!!) Step Sons. And a number after it could refer to the age or birth order of the child mentioned... for me, I have a dd1, dd2, and ds3. That means my first two children are girls, and my "baby" is a boy. Or if I'm mentioning something about my daughter where his age is important, I might say DD8.
(No, it's not that confusing! You'll catch on!)