| J/C | joules per coulomb |
|---|---|
| J/kg | joules per kilogram |
| J/s | joules per second |
| J/T | joules per tesla |
| JA | judgment analysis; juvenile atrophy; juxta-articular |
| JAI | juvenile amaurotic idiocy |
| JAMA | Journal of the American Medical Association |
| JAMG | juvenile autoimmune myasthenia gravis |
| JAMIA | Journal of the American Medical Informatics Association |
| JAN | Japanese accepted name |