[SoftTalker]

Except people call it the "ground" floor which makes sense, not the "zero" floor which does not.

[derriz]

It’s not consistent but I would estimate that “0” buttons are as common as “G” buttons in elevators in Europe - along with -1, -2, etc for basement levels.

[plugin-baby]

0 makes sense when you consider -1 to be the first basement level.

[dr_kiszonka]

Which also gently introduces children to negative numbers : - )