Well, the outer edges look a bit like a floor plan, with spots for windows & a door. The big square could be a bed... But the rest... Could the spot marked 1 be stairs? A trapdoor? Are the letters initials for people? Very mysterious! :)
A trap door! Now that is an intriguing idea.... I was thinking the two circles at the top might be a bicycle...
Did a grown-up draw this, or was it a niece? If it's from a young person, then the sky is the limit as to what it means. Maybe it's a game...1, 2, 3. I do notice that "R" is on the outside and "J" is on the inside.
It's definitely mine, based on where I found it. A game is a likely possibility.,,,