A bogey is a published value for some parameter that is average or typical of devices that will be sold, but with manufacturing tolerances and other variables in production most devices produced will have some variance in each parameter.
A bogey is a published value for a parameter of an electronic component, such as a vacuum tube, that is average or typical of devices that will be sold. With manufacturing tolerances and variables in production, most devices produced do not exactly meet the bogey value for each parameter.