This mod is wonderful and most of the icons explain what effects activate when...

But there are a few icons i think need to be explained here that aren't explained in-game.

The meaning of when room icons appear.
The meaning when a cross and upsidedown cross appear.
The meaning of the bitflip icon.
The meaning of the trap door.

And especially, the one thing i've been unable to figure out on my own even with experimenting...
The meaning of the deleted icon.