// Workers AI · dad joke modeWhy was I4 sad? Because it was a little "off" by 4.

I-4 often refers to Interstate 4, an interstate highway in central Florida.

I-4, I4, i4 or I 4 may also refer to:

Arts, entertainment, and media

• I-4: Loafing and Camouflage, a Greek film

Military

• 1st Life Grenadier Regiment (Sweden) (1816–1927), a Swedish infantry regiment
• Japanese submarine I-4, a World War II Type J1 submarine of the Imperial Japanese Navy
• Life Grenadier Regiment (Sweden) (1928–1997), a Swedish infantry regiment
• Tupolev I-4, a 1927 Soviet aircraft

Science and technology

• I-4 satellite
• i4, an integer in XML-RPC
• Industrie 4.0, the fourth Industrial Revolution
• I4, three-dimensional space group number 79
• I4, three-dimensional space group number 82

Transportation

• I4 engine, a piston engine
• BMW i4, a German mid-size electric sedan
• Interstate Airlines, by IATA airline designator
• LB&SCR I4 class, a British locomotive
• I-4 road (Bulgaria), a major road in Northern Bulgaria

See also

• iPhone 4, a smartphone
• 4I (disambiguation)