What Do the Tiny Signs on NYC Subway Stairs Mean? - Untapped New York
Briefly

The article explains the tiny white signs on NYC subway stairs, which provide essential information about the staircase's location. Each label features a code, starting with 'M' for mezzanine, 'S' for street, or 'P' for platform, followed by a number that indicates the specific staircase. Additionally, when the staircase has multiple sections, letters 'A', 'B', or 'C' designate each channel. These labels aid MTA workers in monitoring and scheduling repairs, establishing a structured navigation system within the station.
The white signs on subway stairs are identifying labels that reveal the staircase's location, with codes indicating levels like 'M' for mezzanine and 'S' for street.
The first letter in the code indicates the level of the staircase: 'M' for mezzanine, 'S' for street, and 'P' for platform, with numbers indicating specific staircases.
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