telltale
n.— «The telltales for gas, oil, temperature, and battery voltage—standard, fixed icons that don’t change in real time—reside in the PROM memory.» —“Design A Minimum-Space Auto-Instrument Module” by Ralph Ong Electronic Design Aug. 4, 1989. (source: Double-Tongued Dictionary)
Further reading
What if, instead of being an inanimate object, a dictionary were alive? That’s the idea behind a lavishly illustrated new children’s book called The Dictionary Story (Bookshop|Amazon) by Oliver Jeffers and Sam Winston. This is part of a...