"Harry stared at Wormtail for a moment, then back at James, who was now doodling on a bit of scrap parchment paper. He had drawn a Snitch and was now tracing the letters L.E. What did they stand for?"
-TOOTP, Chapter Twenty-Eight, Page 642
AWW what do you think they stand for?! It's so cute how James was doodling Lily's initials during an exam.