What is SHMILY?

People have asked what "SHMILY" means that I have on one of the conversation hearts I made in the pictures below. It comes from a story that we read for a Family Home Evening years and years ago. It means: See How Much I Love You. In the story the couple wrote it and left it places for each other, the dust in the mantel, a post it note stuck on a dashboard, in lipstick on the mirror, etc.. We adopted it and use it often in our family. SHMILY shows up all over the house.