What is "opj"

OPJ may stand:

• In the context of French police and judicial proceedings, for Officier de Police Judiciaire ("officer of judicial police"). See Police in France.
• In the context of Computer science, for Orthogonal Persistence for the Java platform, an approach to provide orthogonal persistence for Java (programming language).

OPJ is also a slang term used by many Veronica Mars fans. It refers to one of the characters, Logan Echolls, who is coined the name Obligatory Psychotic Jackass in the very first episode of the show.