Icons at left of topic

Can someone explain them please?
“Light bulb”
“Bubble w/ text”
“Bubble w/ scrolling text”
I waited a week for someone else to ask but no one did so I’ll show my ignorance and ask.

Looks like the bulb means it is pinned.

Bubble w/ text - if you click you go to the first unread post???
Bubble w/ scrolling text - means it is a “hot” thread maybe???

What looks like a light bulb is actually an explanation point. That means it has been pinned to the top of the page.

If there is scrolling text, it means the thread is actively being read. You’ll also notice a star inside some of the icons. That means it is a thread in which you have posted.