Wiktionary
toplight
n. (context nautical English) A lantern or light on the top of a vessel.
Usage examples of "toplight".
So we stand on all night in this loose formation, keeping our eyes fixed most religiously upon the Admiral's toplight when he hoists it.
The mists of the dying night had parted, showing not only a stern-lantern and a toplight but the whole of a ghostly ship, sailing large, standing south, and not two miles away.
The toplights had been roofed over by Sir Lucien, however, but the raised platform, approached by two steps, which had probably been used as a model's throne, was a permanent fixture of the apartment.
He was running without a siren, the driver flashing his toplights briefly at anyone who happened to get in the way.