One of the basic tools that you probably want to keep around your home is a hammer
A basic hammer has a side for pounding (usually nails), a side for removing or pulling nails, and a handle for holding and getting leverage when swinging to pound in a nail. Variations can include the size of the hammer, the length, size and shape of the handle. Instead of a "claw" to help remove nails, some hammers may have a pointed pick on the second end. Hammer handles are frequently made of wood, but can also be made of other materials like plastic or metal.
The part of the piano that connects the pressing of the key to hitting the strings that make the sound is called a hammer.
There are also mechanical hammers for commercial and industrial use. The look different, but still work by pounding.
- Wikipedia's article on hammer
- Harbor Freight Hammers, Mallets & Sledgehammers