This is the 9684th most frequent Russian word.
черным
"Черным" means "black" in the instrumental case or "in black" in Russian.
In this sentence, 'черным' is used as an adjective indirect prepositional form, referring to the color black.
Он написал своё имя черным маркером.
He wrote his name with a black marker.
In this sentence, 'черным' functions descriptively to signify an attribute of the canopy or cover.
Машина была покрыта черным абажуром.
The car was covered with a black canopy.
Here, 'черным' is metaphorical, describing a mood as dark or somber, showing abstract usage.