What does 'signal indication' refer to?

'Signal indication' refers specifically to the information conveyed by the signal aspect. This term encompasses how a signal communicates important details to operators or drivers, typically through its visual display, configurations, or color schemes that indicate different conditions or actions required. For instance, in railway or traffic signals, the aspect might indicate whether to stop, proceed, or prepare to stop, among other instructions.

This concept is crucial in ensuring safety and effective communication in various operational contexts. Operators need to understand what each signal aspect means to make informed decisions. It emphasizes the role of signals in conveying critical information rather than focusing on the manufacturer, maintenance status, or the range of signal types in operation. These aspects are significant in their own right, but they do not pertain to what is meant by 'signal indication' as a definition.