I4

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