What are these UI sprites for?

Adam K M

Active member
For the life of me, I can't remember the instances in which the following icons are used.
Can anyone tell me what they are used for? (I'm changing all the icons, and it helps to know the case in which they're being used for...)

I can assume what #3 is for, but I haven't seen it in a while, so I want to get some confirmation on that. :)

I labeled them 1, 2 and 3... thanks!