I1

I1, i1, or I-1 may refer to:

• Haplogroup I-M253, a human Y-chromosome haplogroup occurring at greatest frequency in Scandinavia
• Japanese submarine I-1, a 1926 Imperial Japanese Navy submarine
• Motorola i1, a smartphone by Motorola
• LB&SCR I1 class, a 1906 British class of 4-4-2 steam tank locomotives
• Polikarpov I-1, a 1923 Soviet monoplane fighter
• I1, a rank-into-rank axiom in mathematical set theory

Topics referred to by the same term

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