A signal set at danger and showing a red light or other stop indication, which a train driver must not pass until it changes or until manually cleared past the signal by a dispatcher.
An indication that a potentially bad or dangerous situation could develop.
A siren or steam whistle, especially one in a factory and used to indicate the beginning or the end of a working day or shift.
An owl.
A woman's breast.
The horn in a motor vehicle.
A penis.
A person who hoots.
A nose, especially a large one.
A large cannabis cigarette.