These examples show status through an indicator light, a color, or a physical state that a person can read at a glance.
A good indicator uses the simplest channel that carries the message and stays readable while people are busy with something else. A great indicator might use an icon or light next to the relevant information channel, without needing text to be understood. This makes it possible for people with different language backgrounds, or pre-language understanding (like babies) to parse the information.
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