https://dysonlogos.blog/2013/12/23/the-key-to-all-this-madness/
A statue or just some "notable" object.
If you go back to some older editions of D&D, especially BECMI; you'll find a "standardised" key/legend of dungeon features that hasn't changed much & should be familiar to "old school gamers". The developer seems to be using a lot of those standard symbols. The "circled star" is a classic. I love it!