信しん号ごう灯とう

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Meanings

1

signal light; indicator light

General term for any light used to convey a signal, such as on a control panel, vehicle dashboard, or traffic signal.

機き械かいの信しん号ごう灯とうが赤あかく点てん滅めつしている。
The machine's signal light is flashing red.

2

Specifically refers to a mechanical or optical signaling device using moving arms or lights, often in railway or maritime contexts.

昔むかしの鉄てつ道どうでは信しん号ごう灯とうとして腕うで木ぎ式しき信しん号ごう機きが使つかわれていた。
On old railways, semaphore signals were used as signal lights.