SPAD

English Wikipedia has an article on:

signal passed at danger

Wikipedia

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• Rhymes: -æd

SPAD

1. (rail transport, UK) Initialism of signal passed at danger.

   Coordinate term: SPAR

SPAD (plural SPADs)

1. (rail transport, UK) An instance of a signal passed at danger.
2. (UK politics, informal) Alternative form of spad (“special advisor in government”)
3. (plant science) A relative measurement of the amount of chlorophyll present in a leaf, based on measurements with a SPAD meter produced by Minolta.
4. (military) Initialism of self-propelled air defense; a self-propelled anti-aircraft vehicle.

SPAD (third-person singular simple present SPADs, present participle SPADing, simple past and past participle SPADed)

1. (rail transport, UK) To pass a signal at danger.

• danger signal

• APDS, ASPD, PDAs, SaPD, daps, pads