n.

an outline of a solid object (as cast by its shadow)

a drawing of the outline of an object; filled in with some uniform color

3D human pose from silhouettes by relevance vector regression
Silhouettes: A graphical aid to the interpretation and validation of cluster analysis
Articulated mesh animation from multi-view silhouettes
Articulated mesh animation from multi-view silhouettes
Inferring 3D Body Pose from Silhouettes using Activity Manifold Learning
Inferring 3D body pose from silhouettes using activity manifold learning
3D articulated models and multi-view tracking with silhouettes
Backpack: Detection of People Carrying Objects Using Silhouettes
Rousseeuw, P.J.: Silhouettes: A Graphical Aid to the Interpretation and Validation of Cluster Analysis. Comput. Appl. Math. 20, 53-65
Flexible syntactic matching of curves and its application to automatic hierarchical classification of silhouettes