An indication that a potentially bad or dangerous situation could develop.
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.
A formal notification or warning.
A published critical review of a play or the like.
A written or printed announcement.
Advance notification of termination of employment, given by an employer to an employee or vice versa.
The act of observing; perception.
Prior notification.
To be noticeable; to show.
To become aware of; to observe.