What Is the Meaning of a Cigarette Butt?

The other day I took me over 24 hours to remember a very particular cultural specific word from my region in Sweden. And I felt weird because I knew what the thing was. It's like, if you have a cigarette, you smoke half of it, and then you put it out and you save the other half. That has a different word than if it's finished. What is the word for that in English? You don't have one. But when it comes to the spooky stuff, we go, that's not a thing. Or maybe we go that the whole thing isn't a thing. We keep hitting this. The universe in which it's language looks exactly like the universe