An Indicator is any device that is used to display data or information.
An alternative description for an Indicator is a Display
If an Indicator or Display panel is also fitted with switches or keypads and is able to provide a control function, such as would be the case with a batch weigher indicator, then it may also be termed as a Controller.
Many applications require some means of displaying data or other information to the user, and indicators vary from simple panels with lamps that can announce a condition, through to sophisticated LCD matrix displays such as are used on modern PC's and mobile phones.
For the purposes of the applications being described on this website, an indicator will have the MINIMUM capability of being able to display digital values in the form of 7-segment LED or LCD panels.