unknownfunction
nounUK /ʌnˈnəʊn ˈfʌŋkʃən/
US /ʌnˈnoʊn ˈfʌŋkʃən/
A job or purpose that nobody knows about.
The strange button on the machine had an unknown function, so nobody pressed it.
OTHER MEANINGS
2. A part of a computer program that does something, but people are not sure what.
The programmer found an unknown function in the code and had to test it.
3. A math rule whose exact job is not yet understood.
The students studied an unknown function and tried to guess its pattern.
4. A feature of a tool or gadget that has no clear use.
The remote control had an unknown function button that did nothing.