Things that don't move and stay in one place.
Stabiles are usually strong and safe.
Examples:
The big rock in the park is a stabile.
The tree is a stabile because it doesn't move.
I like to climb on the stabiles at the playground.
The house is like a stabile, it doesn't move at all.
The mountain is the biggest stabile I've ever seen.
The stabile is so heavy, I can't even push it.