shilling mark vs slant line

shilling mark

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

slant line

noun
  • Synonym of slash ⟨/⟩. 

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