Should the buttons say 1 and 2?
You would think so.
But they say ★LL and UL, as shown here:
|Elevator interface at the Upscale Shopping Mall|
LL (for lower level?) and UL (for upper level?) are the opposite of an empathetic, clear and simple UX that is helpful for users.
The puffery and bloviation inherent in these labels are word crimes. Such language is bad enough in a rental agent's pitch -- "Put your store on the Upper Level, where the other expensive stores are, and the lease costs double!" -- and worse in an interface.
Crimes against language are word crimes against users.