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  2. Push-button - Wikipedia

    en.wikipedia.org/wiki/Push-button

    A push-button (also spelled pushbutton) or simply button is a simple switch mechanism to control some aspect of a machine or a process. Buttons are typically made out of hard material, usually plastic or metal. [1] The surface is usually flat or shaped to accommodate the human finger or hand, so as to be easily depressed or pushed.

  3. Navel - Wikipedia

    en.wikipedia.org/wiki/Navel

    The belly button is unique to each individual due to it being a scar, and various general forms have been classified by medical practitioners. [6] [7] [further explanation needed] Outie: A navel consisting of the umbilical tip protruding past the periumbilical skin is an outie. Essentially any navel which is not concave.

  4. Light switch - Wikipedia

    en.wikipedia.org/wiki/Light_switch

    Pushing the raised button opens or closes the contacts and pops out the previously depressed button so the process can be reversed. In the U.S., the buttons were commonly black; the "on" button typically had a white mother-of-pearl (real or simulated) inlay to indicate its function.

  5. Action (piano) - Wikipedia

    en.wikipedia.org/wiki/Action_(piano)

    The piano action mechanism [1] (also known as the key action mechanism [2] or simply the action) of a piano or other musical keyboard is the mechanical assembly which translates the depression of the keys into rapid motion of a hammer, which creates sound by striking the strings.

  6. Umbonium - Wikipedia

    en.wikipedia.org/wiki/Umbonium

    The shells of the species in this genus are low-spired and shaped like a button. The orbicular shell is depressed and imperforated. It is polished, porcellaneous and has a very thin pearly layer inside. The whorls are flattened above, bright, smooth or spirally grooved. The small, transverse aperture is wider than high. The thin outer lip is ...

  7. Axon terminal - Wikipedia

    en.wikipedia.org/wiki/Axon_terminal

    Axon terminals are specialized to release neurotransmitters very rapidly by exocytosis. [1] Neurotransmitter molecules are packaged into synaptic vesicles that cluster beneath the axon terminal membrane on the presynaptic side (A) of a synapse.

  8. Posselt's envelope of motion - Wikipedia

    en.wikipedia.org/wiki/Posselt's_Envelope_of_Motion

    Translation Translation occurs in the upper TMJ compartment and provides most of the mandible's ability to open. Articular disc and condyle complex slide inferiorly on the articular eminences, allowing maximum depression of the mandible. [7] Maximal Mandibular Opening (T). Condylar heads are said to be at a maximum anterior-inferior position.

  9. Glabella - Wikipedia

    en.wikipedia.org/wiki/Glabella

    The term also refers to the underlying bone that is slightly depressed, and joins the two brow ridges. It is a cephalometric landmark that is just superior to the nasion . [ 1 ]