Invisibility

Invisibility is the power of being invisible. It can be gained by Invisibility cloak, Invisibility Potion, Invisibility Spell or Invisibility Charm, a spell used to render a target area invisible.

Invisibility Token is an item used to activate an Invisibility cloak.

There is a device, Invisibility Booster, which turns turns the car, its passengers, and everything else inside invisible.

There is also a section of books in Hogwarts Library, the books within this section discuss invisibility and are, appropriately, invisible.

Bimetal alchemical thread was a patented magical fibre, invisible to practitioners of the Dark Arts.