It looks to be the notes of a melody. My guess is that I tought of it while driving the car and when I got home I just scribbled it down.
If you're interested, this is what it sounds like (courtesy of ButtonBass and Audacity). Playing it through, I think it sounds better if there's a half beat between the E and C of each line, with the C only being half length. I would have thought so when I wrote it too, though, which means I must have written it with a specific purpose in mind. That would also be why I kept it.
As for what that purpose was, well that's a challenge left me by my 2002 self...