J: Joint Meeting
J: Joule
J: JTM Service
J: Junction
J Box: Junction Box
J-Carrier: Japanese-Carrier
J-hook: J-shaped hook connector
J-SAC: Journal on Selected Areas in Communications
J0: Regeneration section trace byte
J1: Path trace byte
J2: Path overhead byte
J2ME: Java 2 Platform, Micro Edition
J2MV: Japanese 2 Mbps Voice
JAA: Joint Aviation Authorities
Jabber: Jabber XML Messaging
JABS: Just Another Blog on Sports
JABWT: Java Applets for Bluetooth Wireless Technology
Jacl: Java Command Language
JAD: Joint Application Design
JAD: Joint Architectural Design
JAD: Joint Architecture Design
JADE: Java Application Development Environment
JAE: Java Application Environment
JAES: Journal of the Audio Engineering Society
JAIST: Japan Advanced Institute of Science and Technology
JAM: Jini Technology Access Module
JAM: JYACC Application Manager
JAMSAT: Japanese affiliate of AMSAT
JAN: Joint Army-Navy
JANAP: Joint Army-Navy-Air Force Publications
JANET: Joint Academic Network
JANOG: Japanese Network Operators Group
JAPH: Just Another PERL Hacker
JAR: Java Archive
JAR: Joint Aviation Requirements
JARL: Japan Amateur Radio League, Inc.
JAROS: Japan Resources Observation System
JARS: Java Applet Rating Service
JASC: Japan Sea Cable
JASREP: Japan Ship Reporting