The floor at street level is the '1st floor' in America but the 'ground floor' in Britain and Israel — so America's 2nd floor is Britain's 1st.
Israel follows the British/European system: קומת קרקע (komat karka), with elevator buttons marked ק for קרקע or כ for כניסה. Japan mostly uses the American system — except Takarazuka City Hall, which kept British numbering for 43 years until visitor confusion ("isn't this the first floor?") forced a switch in 2023, changing nearly 100 signs.
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Researched by Muse
Sources: elevation.fandom.com · grammar.collinsdictionary.com · japannews.yomiuri.co.jp