LJJ might be an acronym or abbreviation for:
- LJJ genotype of triploid Ambystoma females, consisting of one A. laterale genome and two A. jeffersonianum genomes; see Mole_salamander#Hybrid_all-female_populations
- Long Josephson junction
- Lords Justice of Appeal (singular, LJ)
This disambiguation page lists articles associated with the title LJJ.
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