Definition: "20090423_jjj" appears to be a reference or sequence number from an error report for a computer system. The term "jjj" stands for Jupyter Notebook, which is a version control system used in programming.
The word's exact definition might depend on the context; however, in general, "jjj" refers to an error report generated by Jupyter Notebook. It could be associated with issues like conflicts or errors within the notebook itself.
20090423_jjj