lay figure vs mannequin

lay figure

noun
  • A jointed model of the human body used by artists, or to display clothes. 

  • An unimportant person; a character (especially in fiction) lacking individuality. 

mannequin

noun
  • A jointed model of the human body used by artists, especially to demonstrate the arrangement of drapery. 

  • A dummy, or life-size model of the human body, used for the fitting or displaying of clothes. 

  • An anatomical model of the human body for use in teaching of e.g. CPR. 

How often have the words lay figure and mannequin occurred in a corpus of books? (source: Google Ngram Viewer )