This list contains acronyms, initialisms, and pseudo-blends  that begin with the letter J.

For the purposes of this list:

  • acronym = an abbreviation pronounced as if it were a word, e.g., SARS = severe acute respiratory syndrome, pronounced to rhyme with cars
  • initialism = an abbreviation pronounced wholly or partly using the names of its constituent letters, e.g., CD = compact disc, pronounced cee dee
  • pseudo-blend = an abbreviation whose extra or omitted letters mean that it cannot stand as a true acronym, initialism, or portmanteau (a word formed by combining two or more words).
(a) = acronym, e.g.: SARS – (a) severe acute respiratory syndrome
(i) = initialism, e.g.: CD – (i) compact disc
(p) = pseudo-blend, e.g.: UNIFEM – (p) United Nations Development Fund for Women
(s) = symbol (none of the above, representing and pronounced as something else; for example: MHz – megahertz)

Some terms are spoken as either acronym or initialism, e.g., VoIP, pronounced both as voyp and V-O-I-P.

(Main list of acronyms)

J0–9

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  • JB – (i) Junior Branch
  • JB – (i) Jail Bait
  • JBFSA – (i) Joint Blue Force Situational Awareness
  • JB- Justin Bieber
  • JN – (s) Jan Mayen Island (FIPS 10-4 territory code)
  • JNI – (i) Java Native Interface
  • JNLP – (i) Java Network Launch Protocol
  • JO – (s) Jordan (FIPS 10-4 country code; ISO 3166 digram)
  • JOA – (a/i) Joint Operations Area
  • JOD – (s) Jordanian dinar (ISO 4217 currency code)
  • Jofa – (p) Jonssons fabriker (Swedish, "Jonsson's Factories")
  • JOPES – (a) Joint Operations Planning and Execution System
  • JOR – (s) Jordan (ISO 3166 trigram)
  • JOTS – (a) Joint Operations Tactical System
  • JSP – (a) Joint Services Publication