| | ibnr | | incurred but not reported |
| | ibtd | | I beg to differ |
| | IBTL | | In Before The Lock |
| | IBTNP | | I bet the next person |
| | icam | | I couldn't agree more |
| | ICANN | | Internet Corporation for Assigned Names & Numbers |
| | ICANN | | Internet Corporation for Assigned Names and Numbers |
| | ICAO | | International Civil Aviation Organization |
| | ICB | | I care because? |
| | ICBA | | I can't be arsed |
| | ICBA | | I can't be asked |
| | ICBI | | I can't believe it |
| | ICBIGBA | | I can’t believe I got booted again |
| | icbijst | | I can't believe I just saw that! |
| | ICBM | | InterContinental Ballistic Missile |
| | ICBWT | | I could be wrong though |
| | ICDL | | International Computer Drivers License |
| | ICEDI | | I can't even discuss it |
| | ICF | | Internet connection firewall |
| | ICFILWU | | I could fall in love with you |
| | ICIHICPCL | | I Can't Imagine How I Could Possibly Care Less |
| | ICL | | in christian love |
| | ICL | | Instructions Come Later |
| | ICMFP | | I Claim My Five Pounds |
| | ICMP | | Internet Control Message Protocol |
| | ICNAFM | | I Could Not Ask For More |
| | ICOCBW | | I Could Of Course Be Wrong |
| | ICOCBW | | I Could, Of Course, Be Wrong |
| | ICOM | | inputs, outputs, controls and mechanisms |
| | ICOs | | Issues , Concerns and Opportunities |
|