| Acronym | Definition |
|---|
| I&I➣Industrial and Institutional |
| I&I➣Inflow & Infiltration |
| I&I➣Injury & Illness |
| I&I➣Inspector & Instructor |
| I&I➣Interoperability and Integration |
| I&I➣Industrial and Institutional cleaning |
| I&I➣Installation and Integration |
| I&I➣Inflammation and Immunity (medical disorders) |
| I&I➣Impact & Implementation |
| I&I➣Inventions & Innovations (US DOE) |
| I&I➣Intercourse and Intoxication (GI update of R&R) |
| I&I➣Items and Instructions |
| I&I➣Interworking and Interoperability |
| I&I➣Inquiries & Investigations |
| I&I➣Interoperability & Interchangeability |
| I&I➣Incremental & Iterative |