“93” most commonly refers to: United Airlines Flight 93: A plane hijacked during the September 11, 2001, attacks.
The Number 93: The natural number following 92 and preceding 94.
Seine-Saint-Denis (93): A French department in the Île-de-France region. Neptunium: The chemical element with atomic number 93.
“Ninety-Three” (Quatrevingt-treize): A novel by Victor Hugo. 93 (Bus): An MBTA bus route. “93”: A song by Hans Williams.
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Is this about the history, a specific song, or something else? Let me know so I can provide more specific details. 93 | Bus – MBTA