Another Office Building Sign

The office building I work in isn't anything out of the ordinary. There's one thing I like about it, and that is the fact that the stairs are not locked. I'm working on the 6th floor, but some of the people I need to talk to during the course of the day work on the 5th floor. It is very easy for me (and usually faster, too) to take the stairs.

Have you ever wondered, though, what the singular form of "stairs" is? Well, here is the answer:

Yes, this is a sign indicating where the "stair" is. I don't use this stair, though. Instead, I use the stairs that go all the way from one floor to the next.