The button on top of a hat is called a "top button" or a "crown button." It is a decorative feature that can also be functional in some hats.
The top of a wavelength is called the crest.
The top part of a shoe is called the upper
A ballpoint pen contains a simple machine called a lever. When you click the button at the top of the pen or press the pocket clip to extend or retract the pen tip, you are utilizing a lever mechanism.
The top part of a wave is called the crest, while the bottom part is called the trough.
The distance from the top of one wave to the top of the next wave is called the wavelength. It is commonly denoted by the symbol λ and is a characteristic of waves that can be used to describe their properties.
The button!
A Visor. Is this what your asking for? QUICK FACT: A visor is mostly used in Tennis and golf.
A Shriner's hat is called a fez. It is typically red in color and features a black tassel hanging from the top.
a sombrero
It's called a top hat.
The button on a baseball cap is difficult to fix because of it's size and the location on the top of the cap. However, a button may be removed and another one placed in the location. A hat-shop may be able to replace this button for a small fee.
a hat
office button
The name of the hat with a flat top worn at graduation ceremonies is called a mortarboard.
Abe Lincoln's hat was called a stove pipe hat because the rise is so tall and straight with no flare that it resembles the length of a pipe. Your welcome
A top hat, silk hat, cylinder hat, chimney pot hat or stove pipe hat (sometimes also known by the nickname "topper")
If you mean the red button in the top right corner it is called close.