JJ or jj may refer to: Jelena Janković, professional tennis player Jesu Juva, used by Johann Sebastian Bach at the beginning of his compositions Jj coupling, a form of angular momentum coupling JJ Lehto, Finnish motorsport racing driver JJ (magazine), a fashion magazine J. J. Thomson, a scientist . JJ (video game), a video game developed and published by Square Co., Ltd. JJ, a brassiere measurement in the UK JJ, TAM Airlines's IATA code Robert Jay (judge), noted in court reports as "Jay J." Justo Justo or JJ, Filipino columnist & presenter J/Z (New York City Subway service) or formerly JJ