When I'm accessing my colonist's thoughts...
Food and rest are obvious, the blue bar is how much they have and the red triangle shows whether that's increasing or decreasing.
The mood bar shows current mood. But...
Red Triangles show whether it's increasing or decreasing. The two "breakdown" threshholds show in red.
What is the white pyramid? I have colonist that are neutral and some that are content and some neutral ones have more than the pyramid mark while other have less.
The white triangle marks where your mood will end up, notice that mood doesnt change instantly, rather it slowly increases or decreases, and the triangle is there to mark that spot.
Thanks for that. I've tried to update the wiki in this regard as well. If you'd like to check http://rimworldwiki.com/wiki/Mood for any errors or omissions, that'd be great.