SPAD

English Wikipedia has an article on:

signal passed at danger

Wikipedia

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• (deprecated use of |lang= parameter) Rhymes: -æd

SPAD

1. (rail transport, UK) (deprecated use of |lang= parameter) Initialism of signal passed at danger.

SPAD (plural SPADs)

1. (rail transport, UK) an instance of a signal passed at danger
2. (politics, UK) A special adviser
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

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