| Acronym | Meaning |
 | JDK | Java Developers (Development) Kit |
| JEIDA | Japan Electronic Industry Development Association |
| JFIF | JPEG File Interchange Format |
| JPEG | Joint Photographic Experts Group |
| KB | Kilobit |
| KB | Kilobyte |
| KBPS | Kilobits Per Second |
| L2TP | Layer Two Tunneling Protocol |
| LAN | Local Area Network |
| LAWN | Local-Area Wireless Network |
| LBA | Logical Block Addressing |
| LBV | Layered Biometric Verification |
| LCD | Liquid-Crystal Display |
| LDAP | Lightweight Directory Access Protocol |
| LED | Light Emitting Diode |
| LEP | Light Emitting Polymers |
| LGMR | Laser Guided Magnetic Recording |
| LI-ION | Lithium Ion |
| LIFO | Last In, First Out |
| LILO | Linux Loader |
| LIM | Lifeline Interface Module |
| LIM | Lotus-Intel-Microsoft |
| LMB | Left Mouse Button |
| LPM | Lifeline Port Module |
| LPM | Lines Per Minute |
| LPT | Local Printer Terminal |
| LTO | Linear Tape Open |
| LZW | Lempel-Zif-Welsh |
| MAE | Metropolitan Area Exchange (Ethernet) |
| MAN | Metropolitan Area Network |
| MAPI | Messaging Application Programming Interface |
| MARS | Multi-player Animated Role-playing System |
| MATHML | Mathematical Markup Language |
| MAU | Media Access Unit |
| MAU | Multistation Access Unit |
| MB | Megabit |
| MB | Megabyte |
| MBPS | Megabits Per Second |
| MBR | Master Boot Record |
| MCA | Micro Channel Architecture |
| MCGA | Multi-Color Graphics Array |
| MCI | Media Control Interface |
| MDA | Monochrome Display Adapter |
| MDC | Metadata Coalition |
| MDI | Multiple Document Interface |
| MDIS | Metadata Interchange Specification |
| MEMS | MicroElectro-Mechanical System |
| MFLOPS | Millions Of Floating Point Operations Per Second |
| MFM | Modified Frequency Modulation |
| MIB | Management Information Base |
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