The faucet use to be called a valve. The valve has been a way of shutting on/off water flow all the way back to the Egyptians, Romans and Greeks. The Romans helped to better the system by running water into buildings. In 1870 JH Davis got a patent on a globe valve.
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Female x Female coupling
Its the faucet handle
As in any faucet, you take it apart and replace the cartridge or the rubber seal.
A faucet handle and jar lid are simple machines.
You close the 2 shut off valves below the faucet, remove the pipes going to faucet from both ends. Now you will see the 2 large flat nuts holding the faucet to countertop. These will be easier to remove with a plumbers faucet wrench (about $8 in your hardware store) This has a long shaft and a flat spring loaded head. Remove both nuts and pull faucet out. When you go th get new faucet,also buy braided SS flexible water lines. About $4 each, they are much simpler and better than the cheap grey plastic ones. Re-connect everything opposite order.