Let's say it's just telling us our velocity in the horizontal direction. And oftentimes when something's one dimension, people forget, well, that too can be a vector quantity. In fact, this velocity is a vector quantity because you could think of it, if it's positive, it's moving to the right, and if it's negative, it's moving to the left. So it has a direction. And so sometimes you will see a vector quantity like this have a little arrow on it. Or you will see it bolded, or you will see it bolded like that. I like to write an arrow in it, although that's not always the convention used in different classes.