silhouette

sil|hou|ette /s'ɪlu'et/ (silhouettes)
1 [N-COUNT]
A silhouette is the solid dark shape that you see when someone or something has a bright light or pale background behind them.
The dark silhouette of the castle ruins stood out boldly against the fading light.
2 [N-COUNT]
The silhouette of something is the outline that it has, which often helps you to recognize it.
...the distinctive silhouette of his ears...