In some countries (e.g. Japan), the floor you enter the building at is the first floor, and in others (e.g. UK) it's the ground floor. So if there are 4 floors, they could be 1, 2, 3, 4, or they could be G, 1, 2, 3.
In some countries (e.g. Japan), the floor you enter the building at is the first floor, and in others (e.g. UK) it's the ground floor. So if there are 4 floors, they could be 1, 2, 3, 4, or they could be G, 1, 2, 3.