Ratchet may refer to:
  • Ratchet (device)
    Ratchet (device)
    A ratchet is a device that allows continuous linear or rotary motion in only one direction while preventing motion in the opposite direction. Because most socket wrenches today use ratcheting handles, the term "ratchet" alone is often used to refer to a ratcheting wrench, and the terms "ratchet"...

    , a mechanical device that allows movement in only one direction
  • Ratchet, a tool also known as a socket wrench
    Socket wrench
    A socket wrench is a wrench with interchangeable heads called sockets that attach to a fitting on the wrench, allowing it to turn different sized bolts and other fasteners. The most common form is a hand tool popularly called a ratchet consisting of a handle with a ratcheting mechanism built in,...

  • Ratchet (instrument)
    Ratchet (instrument)
    A ratchet, also called a noisemaker , is an orchestral musical instrument played by percussionists. Operating on the principle of the ratchet device, a gearwheel and a stiff board is mounted on a handle, which can be freely rotated...

    , a music instrument

In film and television:
  • Ratchet (Transformers)
    Ratchet (Transformers)
    Ratchet is the name of several characters in the Transformers universes. According to the original creator of the Transformers names, Bob Budiansky, Ratchet was named after the character of Nurse Ratched from the film One Flew Over the Cuckoo's Nest. The name Ratchet is almost always portrayed as...

    , a character in the franchise Transformers
  • Ratchet (Robots), a character in the film Robots
  • Ratchet, a character in the Widget the World Watcher television series

In games:
  • Ratchet (Ratchet & Clank)
    Ratchet (Ratchet & Clank)
    Ratchet is the main character of the Ratchet & Clank series of video games. Ratchet is tall, 15 years old and weighs 151 lbs . In the English versions of the games, Ratchet is voiced by Mikey Kelley in the first Ratchet & Clank and by James Arnold Taylor in all the others...

    , a game character
  • Ratchet, a town in World of Warcraft
    World of Warcraft
    World of Warcraft is a massively multiplayer online role-playing game by Blizzard Entertainment. It is the fourth released game set in the fantasy Warcraft universe, which was first introduced by Warcraft: Orcs & Humans in 1994...

In other:
  • Ratchet, a financial derivative also known as cliquet
    A cliquet option or ratchet option is an exotic option consisting of a series of consecutive forward start options. The first is active immediately. The second becomes active when the first expires, etc. Each option is struck at-the-money when it becomes active.A cliquet is, therefore, a series of...


See also

  • Quantum stirring, ratchets, and pumping
    Quantum stirring, ratchets, and pumping
    A pump is an alternating current-driven device that generates a direct current . In the simplest configuration a pump has two leads connected to two reservoirs. In such open geometry the pump takes particles from one reservoir and emits them into the other...

    , in physics
  • Brownian ratchet
    Brownian ratchet
    In the philosophy of thermal and statistical physics, the Brownian ratchet, or Feynman-Smoluchowski ratchet is a thought experiment about an apparent perpetual motion machine first analysed in 1912 by Polish physicist Marian Smoluchowski and popularised by American Nobel laureate physicist Richard...

    , in physics
  • Muller's ratchet
    Muller's ratchet
    In evolutionary genetics, Muller's ratchet is the process by which the genomes of an asexual population accumulate deleterious mutations in an irreversible manner....

    , in genetics
  • Ratchet effect
    Ratchet effect
    A metaphorical ratchet effect is an instance of the restrained ability of human processes to be reversed once a specific thing has happened, analogous with the mechanical ratchet that holds the spring tight as a clock is wound up...

    , irreversible, or difficult to reverse, processes in economics
  • Nurse Ratched
    Nurse Ratched
    Nurse Mildred Ratched is the primary antagonist from Ken Kesey's 1962 novel One Flew Over the Cuckoo's Nest, as well as the 1975 film. A cold, sociopathic tyrant, Nurse Ratched has become the stereotype of the nurse as a Battleaxe...

    , a fictional character from One Flew Over the Cuckoo's Nest
  • Nurse Ratchet, a fictional character from the animated series Futurama
    Futurama is an American animated science fiction sitcom created by Matt Groening and developed by Groening and David X. Cohen for the Fox Broadcasting Company. The series follows the adventures of a late 20th-century New York City pizza delivery boy, Philip J...

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