Declaring Python variables. There are two phases of creating a variable: 1  First, you need to initialize a variable by creating a container and assign it a name. 2  This is called initialization. 3  Second, you assign value to the the variable. 4  This is known as assignment.
Cylindricity-Cylindricity describes a condition of a surface of revolution in which all points of a surface are equidistant from a common axis. Symbol: . Cylindricity controls a cylindricals features element such that the total variations are minimized during manufacturing.
definition : rapidity Mathematically, rapidity can be defined as the hyperbolic angle that differentiates two frames of reference in relative motion, each frame being associated with distance and time coordinates. In relativity, rapidity denoted by w is commonly used as a measure for relativistic