In literature, "indicator" is employed in a range of contexts that blend the technical with the metaphorical. It is frequently used to denote measuring instruments or devices that display quantitative data—such as a speedometer reading increasing steadily ([1], [2]), a pressure gauge on a lamp ([3]), or even the precise adjustments of mechanical instruments ([4], [5]). At the same time, the term extends to abstract representations, signaling shifts or conditions in broader scenarios like population dynamics ([6]) or societal markers of health and discrimination ([7]). Moreover, "indicator" can serve as a narrative device that subtly guides the reader to infer underlying states, whether by marking time with a clock hand ([8]) or symbolizing emotional or contextual shifts ([9]).