The ship of Tom Marvolo Riddle and Hermione Granger from the Harry Potter series though the ship is not cannon. This ship is typically only found in fanfiction and a large pull behind it is the similarities between the two characters. Knowledge seekers and highly intelligent. One goes on to become a powerful Dark Lord and the other is considered the brightest witch of her age as well as being instrumental in helping to defeat Voldemort (in cannon). It is referred to as Tomione or mentioned as TRHG.
Tomione is used to identify the pairing of Tom Riddle and Hermione Granger. In an AU world of Harry Potter Hermione Granger somehow comes into contact with Tom Marvolo Riddle (AKA Lord Voldemort). Through this contact some form of a relationship forms through their interactions and can eventually lead to a romantic relationship. This pairing typically fights against each other, but something generally draws them together. Both are highly intelligent, love learning, seek out knowledge on magic, top students, Prefects and members of the Slugclub...they've got much in common though many issues to battle through.