The visible appearance of a signal that conveys its instruction is called what?

• A. Signification
• B. Indication
• C. Aspect
• D. Rule

Answer: (C)

In railroad signaling, the term aspect refers to the visible presentation of a signal—the colors and positions shown—that tells the engineer what action to take. The best answer names the signal’s displayed form itself, the thing you read as you approach. For example, a red aspect means stop, a proceed aspect means go, and so on. The other terms don’t describe the signal’s actual display: signification isn’t the standard label for the visual form, indication is a broader idea of suggesting something rather than naming the display, and a rule is a directive, not the signal’s appearance.