diagonal vs shilling mark

diagonal

noun
  • Synonym of slash ⟨/⟩. 

  • A line or cut across a fabric at an oblique angle to its sides. 

  • A line joining non-adjacent vertices of a polygon. 

  • A line or plane at an oblique angle to another. 

adj
  • Having a slanted or oblique direction. 

  • Of or related to the cater-corner (diagonally opposite) legs of a quadruped, whether the front left and back right or front right and back left. 

  • Joining two nonadjacent vertices (of a polygon or polyhedron). 

  • Having slanted or oblique lines or markings. 

shilling mark

noun
  • Synonym of slash ⟨/⟩ in its use to mark the amount of shillings in a sum or (obsolete) in all its uses. 

How often have the words diagonal and shilling mark occurred in a corpus of books? (source: Google Ngram Viewer )