This is the difference between British system and US system.
In British system, the street level is called as “Ground Floor”, or “G/F” the level above street level is called “1st Floor” or “1F”. U.K. , Hong Kong, South Africa etc, use the U.K. system.
In the US system, the street level is called as “1st Floor”, (1F), the level above is called as “2nd Floor”, (2F).
US, Taiwan use this system.
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