Cylinder
Cylinder
Anatosaurus
The word <b>cylinder</b> has several meanings: <ul> <li> <a href="Cylinder (algebra)">Cylinder (algebra)</a>, the cartesian product of a set with its superset <li> <a href="Cylinder (geometry)">Cylinder (geometry)</a>, a three-dimensional geometric surface <li> <a href="Cylinder (engine)">Cylinder (engine)</a>, the space within which a piston travels in an engine <li> <a href="Cylinder (disk drive)">Cylinder (disk drive)</a>, a unit of data division on a hard disk drive <li> <a href="Gas cylinder">Gas cylinder</a>, containers used to store compressed gases or compressed air <li> <a href="Phonograph cylinder">Phonograph cylinder</a>, the dominant medium of audio storage from the 1870s to the 1910s and in limited use (such as in the dictaphone) through the mid 20th century <li> In <a href="Firearm">firearms</a>, the <b>cylinder</b> is the rotating device that contains the firing <a href="Chamber (weaponry)">chambers</a> of a <a href="Revolver">Revolver</a>. <li> A type of <a href="Lens">Lens</a> and a form of <a href="Refraction error">Refraction error</a>. </ul>