| Acronym | Definition |
|---|
| SYI➣Sell Your Item |
| SYI➣Seijiro Yazawa Iwai (Toshiba distributor) |
| SYI➣Summer Youth Institute (various organizations) |
| SYI➣Shanxi Yuansheng Industrial Co. Ltd. (China) |
| SYI➣stealing your info |
| SYI➣Systemic Yeast Infection (canine disease) |
| SYI➣Share Your Ignorance |
| SYI➣Sustainable Yield Index (agriculture; India) |