| Abbreviation | Definition |
|---|---|
| JAMS | Julia And Mandelbrot Sets |
| JAPA | Japan Automotive Products Association |
| JARS | Joint Assessment Self System |
| JAV | Jandy Actuator Valve |
| JAVA | a programming language (Sun Microsystems) |
| JBC | Jon's Binary Clock |
| JBC | Jumbo Blast Cooler |
| JBCF | Jeweled Bearing Continuous Flowmeter |
| JBPO | Japan Blood Products Organization |
| JCK | Jewelers' Circular Keystone |
| JCST | Jacket Coring Stripping Tool |
| JD | Jet Dry |
| JDEP | Joint Distributed Engineering Plant |
| JDM | Japanese Domestic Manufacture |
| JFD | Jet Freezing Device |
| JFS | Jet Freezing System |
| JFS | Jet Fuel Starter |
| JJP | Johnson and Johnson Products |
| JL | Jet Lube |
| JLR | Jaguar Land Rover |