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It is a fairly recent development, but I now see (in some European countries, and even in my home country) some buildings where ground level is labelled zero, and subterranean levels are even labelled with negative numbers! Makes complete sense to me, but it does appear to be a fairly recent thing.In my country, ground level used to be (and often still is) labelled as G. Floors above were labelled from 1. Floors below were often labelled B1, B2, etc (or sometimes P1, P2, etc in commercial buildings).
It is a fairly recent development, but I now see (in some European countries, and even in my home country) some buildings where ground level is labelled zero, and subterranean levels are even labelled with negative numbers! Makes complete sense to me, but it does appear to be a fairly recent thing.
In my country, ground level used to be (and often still is) labelled as G. Floors above were labelled from 1. Floors below were often labelled B1, B2, etc (or sometimes P1, P2, etc in commercial buildings).