It translates as: 'bread, education, freedom' and comes from an event many years ago in Greece, when a group of students were protesting and chanting this at the gates of their schools and universities. Unfortunately they were run over by tanks, but the phrase has been passed through generations and has become more well known than the story.
It sounds a bit random, I guess, but it's the only phrase I could think of which relates to food and schools...and protesting of course.