I4, i4, I 4 or I-4 may be:
I4 engine, a designation for an inline-4 piston engine
I-4 satellite
HIJMS I-4, a World War II Imperial Japanese Navy J1 type submarine
LB&SCR I4 class, a British LB&SCR locomotive
Tupolev I-4, a 1927 Soviet aircraft
iPhone 4, a smartphone released by Apple Inc. in 2010
and also :
Interstate 4, a Florida highway
Hurricane Charley - The "I-4 Hurricane". The storm's core followed a path over I-4 from Lakeland to Orlando to Daytona, spending nearly 5 hours "driving" the highway at 20-25 MPH.
Interstate Airlines IATA airline designator
International Information Integrity Institute (I-4), a membership-driven program established in 1986 by SRI International, focused on security-related issues and solutions
i4, an integer in XML-RPC
I 4, a Swedish regimental designation (4th Infantry Regiment) that has been used by the following units:
Första livgrenadjärregementet (1816–1927)
Livgrenadjärregementet (1928–1997)
I-4:Loafing and Camouflage, a Greek film
