| Acronym | Definition |
|---|
| UIN➣User Identification Number |
| UIN➣Unique Identifying Number |
| UIN➣User Inactivity Monitor |
| UIN➣Universal Identification Number |
| UIN➣Universal Internet Number (ICQ) |
| UIN➣Unique Identification Number |
| UIN➣University Identification Number |
| UIN➣User Identification Number (ICQ) |
| UIN➣Quincy, IL, USA - Baldwin Field (Airport Code) |
| UIN➣University Information Network (Egypt) |
| UIN➣Unit Identification Number |
| UIN➣Urban Investment Network (Urban Land Institute) |
| UIN➣Union Inspection Notice |
| UIN➣Unité d'Imagerie Numérique (French: Digital Imaging Unit; radiology) |
| UIN➣Useless Inert Nothing |
| UIN➣Unemployment Identification Number |
| UIN➣Union Improvement Notice (UK) |