Zabby is a shipper term used to describe the possibility of a romantic relationship between Mossad Liaison Officer-turned-NCIS Special Agent Ziva David and NCIS Forensic Scientist Abigail Sciuto.
Ziva and Abby in the Season 9 finale episode, "Till Death Do Us Part".
Abby and Ziva in the Season 6 episode, "Love and War".
Ziva and Abby in the Season 4 episode, "Grace Period".
Ziva and Abby in the Season 3 episode, "Iced".
Abby and Ziva in the Season 3 episode, "Switch".