Recitations (and I’m in college right now, FTR.)
At UC Berkeley, they were called “discussions.”
I didn’t have lecture TAs as an undergrad (only labs), and when I was a TA it was for labs, so there were no extra sessions… are these for additional material, or to go over already-taught material? If it’s the second, as a student we called them “revisiones”, which means “review sessions”.
Precepts.
Eff you both. I wanted to make that joke!
On a more serious note, I never had any of these sessions. Are they a grad school thing?
Offically, they were called ‘lab sections’ or just ‘labs’. In the one class i had that used them we called them "a living hell’ as it was run by a Chinese grad student TA who could bearly understand us and whom we could bearly understand, who had all sorts of problems trying to explain anything to us.

On a more serious note, I never had any of these sessions. Are they a grad school thing?
No, it was an undergraduate thing in my experience. At my school, the core classes were taught in a 500-person lecture hall (Darrin Communications Center Room 308, for RPI grads), which is too big for personal attention. So the recitations are held in small groups of under 20-30 so that you can get questions answered.
Never mind. We had labs. I didn’t realize we were talking about those - we got credit for them (1 hour I think).