something used by send an important signal, often a warning, from a thing to any humans who might be using it or others who might need to know the state the thing is in

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tile-indicator-button file-tree concept for aggregated alarms on a touchscreen

I've been kicking around a few ideas, and I think I've hit upon a potentially neat and elegant idea for a way displaying alarms on a touchscreen that just tells the user the minimum they need to know. ...
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Smartphone indicator light colors - conventional meaning?

This is something I noticed on my Android device. When you have a notification, there's a slowly pulsing notification light when your phone is sleeping. e.g. This light comes in different colors, ...