Ever wondered what the post icons were? Well if you haven't figured it out already, here they are.

 Default.png

Located at https://powdertoy.co.uk/Applications/Application.Discussions/Design/TopicIcons/Default.png

Default thread icon, used when thread is neither sticky, locked, or active.

 Locked.png

Located at https://powdertoy.co.uk/Applications/Application.Discussions/Design/TopicIcons/Locked.png

Locked thread icon, used when thread is not sticky, but locked by moderator action.

 Hot.png

Located at https://powdertoy.co.uk/Applications/Application.Discussions/Design/TopicIcons/Hot.png

Active thread icon, used when thread is not sticky or locked, but is active ('hot').

 Sticky.png

Located at https://powdertoy.co.uk/Applications/Application.Discussions/Design/TopicIcons/Sticky.png

Stickied thread icon, used when thread is not locked, but is stickied by moderators. These always appear at the top of the list.

 StickyLocked.png

Located at https://powdertoy.co.uk/Applications/Application.Discussions/Design/TopicIcons/StickyLocked.png

Stickied and locked thread icon, used when thread is both locked and stickied by moderators. These always appear at the top.

There is, for some reason, no StickyHot.png.

And that's all