Cylinder, a unit of data division on a hard disk drive:
In the Cylinder-head-sector hard disk addressing method, a reference to the three-dimensional object made from a single track projected through all platters in the drive. The name refers to the shape of this theoretical disk object, because it occupies the same shape in space, as the cylinder disk drive. (see next entry).
Hydraulic cylinder, a cylinder barrel with piston rod for pushing and pulling using pressurized fluid
Pneumatic cylinder, a cylinder barrel with piston rod for pushing and pulling using compressed gases
Gas cylinder, containers used to store compressed gases or compressed air
Diving cylinder, a type of gas cylinder used in Scuba diving
Graduated cylinder, glassware used for measurement of liquids in laboratories
Phonograph cylinder, 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
Cylinder (firearms), the rotating device that contains the firing chambers of a revolver
Cylinder lock, the part of a lock that is profiled to accept a specific key