| Abbreviation | Definition |
|---|---|
| IO | In Order .... |
| IO | In Our |
| IOHO | In Our Humble Opinion |
| ION | Item Of Note |
| IOW | In Other Words, .... |
| IRCC | I Really Couldn't Care |
| IRDC | I Really Do Care |
| IRDC | I Really Don't Care |
| IRL | It's Ridiculously Lame |
| IRS | It Really Stinks |
| IRT | In Regard To |
| IRWY | I Rock With You |
| ISFB | I'm So Frigging Bored |
| ISO | It's So Obvious |
| ISTG | I Stan This Group |
| ISTG | I Swear To God |
| ISTQB | International Software Testing Qualifications Board |
| ITϿ | International Texting |
| IT | Is The |
| ITAB | Individualized texting for adherence building |