The lights merely signified the absence, rather than the presence, of colorful news.
These lights signified another craft, and as they dwindled, they were suddenly blocked out.
There was little mystery as to what the flashing blue lights just off Liberty Avenue in downtown Pittsburgh signified.
A buzzer sounds when an infantryman is hit and a blinking yellow light signifies that a tank has been knocked out of action.
The white light signifies that the House of Representatives is in night session.
The red light signifies that the Senate is in night session.
The red light of dawn therefore signifies the blood produced by this slaughter.
At times, distant lights glowed through the star-struck darkness, but there was no way of telling what the lights might signify.
He knew immediately what each light signified.
It was turning slowly, lights and whistles signifying geologic movement on San Andreas.