J2

J2, J.II or J-2 may refer to:

== Codes and classifications == J2, the IATA airline designator for Azerbaijan Airlines J-2 visa, a nonimmigrant visa issued by the United States for spouses and dependents of J-1 visa exchange visitors ATC code J02, a subgroup of the Anatomical Therapeutic Chemical Classification System Haplogroup J2 (Y-DNA), a Y-DNA haplogroup Janko group J2 in mathematics Jinja2, a Python template engine that uses file extension .j2 J_2 \,, a celestial body's second dynamic form factor J_2 \,, the second invariant of the deviatoric stress tensor