1l or 1-L may refer to:
*
first-line medical treatment, 1L treatment, first-line therapy (2L, 3L, etc.)
*
Marawing 1-L Malamut, Czech ultralight aircraft
*
Toyota 1L
*
Volkswagen 1-litre car
*First year
law school student in the United States
*
Liberland radio prefix
See also
*
L1 (disambiguation)
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