JACM Journal of the Association for Computing Machinery
JANET Joint Academic Network (UK)
JBS John Birch Society
JC Jesus Christ
JC Joint Compound (plumbing)
JC Julius Caesar
JC Junior College
JCA Jewelry Crafts Association
JCAC Joint Civil Affairs Committee
JCAE Joint Committee on Atomic Energy
JCEE Joint Council on Economic Education
JCET Joint Council on Educational Television
JCS Joint Chiefs of Staff
JD Justice Department
JDS John Dewey Society
JEM Japanese Experiment Module (para SSF) (Espacial)
JES John Ericsson Society
JET Joint European Torus (pesquisa de fusão)
JFK John F. Kennedy
JFK John F. Kennedy (aeroporto internacional)
JFMIP Joint Financial Management Improvement Program
JGR Journal of Geophysical Research
JGR Journal of Geophysical Research (Espacial)
JI Justice, Inc.
JIC Joint Intelligence Center
JIC Just in Case
JILA Joint Institute for Laboratory Astrophysics (Espacial)
JIM Job Information Memorandum
JINTACCS Joint INteroperability of TActical Command and Control Systems
JIS Japan Industrial Standards
JISC Japanese Industrial Standards Committee
JIT Just In Time
JMS John Milton Society
JNT Joint Network Team (UK)
JO Job Order
JO Junior Officer
JOVE Jonathan's Own Version of Emacs
JOVIAL Jules Own Version of the International Algorithmic Language
JPL Jet Propulsion Laboratory
JPL Jet Propulsion Laboratory (Espacial)
JRC Junior Red Cross
JSC Johnson Space Center
JSC Johnson Space Center (NASA) (Espacial)
JSD Jackson System Development
JSRC Joint Services Review Committee
JTIDS Joint Tactical Information Distribution Systems
JV Junior Varsity
JvNC John von Neumann (Super Computer) Center
JvNCnet John von Neumann (Super Computer) Center network
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