Rather, it is a common design format for instrument interfaces.
There are many types of instruments in the keyboard family, such as string, brass (and other metals), woodwind, percussion, electronic, digital, idiophone, and more.
Instruments can also be classified by audio generation method.
For example, some authorities regard families as encompassing only instruments of different pitch range that have similar construction and tone quality.
They therefore, for example, do not regard the cor anglais as a member of the oboe family, because its narrow bore and piriform bell give it a distinctly different tone quality from the oboe.