I1, i1, or I-1 may refer to:
*
Haplogroup I-M253, a human Y-chromosome haplogroup occurring at greatest frequency in Scandinavia
* , a 1926 Imperial Japanese Navy submarine
*
Motorola i1
The Motorola i1 is an Internet-enabled smartphone by Motorola
Motorola, Inc. () was an American multinational telecommunications company based in Schaumburg, Illinois, United States. After having lost $4.3 billion from 2007 to 2009, t ...
, a smartphone by Motorola
*
LB&SCR I1 class
The LB&SCR I1 class was a class of 4-4-2 steam tank locomotives designed by D. E. Marsh for suburban passenger service on the London, Brighton and South Coast Railway.
History
This class was intended to haul secondary passenger trains, espe ...
, a 1906 British class of 4-4-2 steam tank locomotives
*
Polikarpov I-1, a 1923 Soviet monoplane fighter
* I1, a
rank-into-rank
In set theory, a branch of mathematics, a rank-into-rank embedding is a large cardinal property defined by one of the following four axioms given in order of increasing consistency strength. (A set of rank < λ is one of the elements of the set V< ...
axiom in mathematical set theory
* I won, as it is pronounced similarly
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