To have control is to have the power to run something in an orderly way. A skillful teacher maintains control over students who might otherwise waste time or be disruptive. A control can also be a device used to operate a machine, like the remote control for a television.
a thing used as a standard of comparison for checking the results of a survey or experiment.
Information security controls are processes and policies you put in place to mitigate risk. ISO/IEC 27001 requires organisations to implement controls that meet its standards for an information security management system.