backslash vs solidus

backslash

noun
  • Used erroneously in reference to, or in reading out, the ordinary slash, that is, the punctuation mark /. 

  • The punctuation mark \. 

  • |passage= […] I was trying to find a web-site for which I had been given the following address: http://www.isop.ucla.edu/pacrim/pubs/korjournal.htm. […] I began to work backwards, removing first the last part of the address following the last backslash (/korjournal.htm).}} 

verb
  • To escape (a metacharacter) by prepending a backslash that serves as an escape character, thereby forming an escape sequence. 

solidus

noun
  • Synonym of slash ⟨/⟩, originally (UK) in its use as the shilling mark and now its formal designation by the ISO and Unicode. 

  • Its successor Byzantine coins, from the eleventh century onward of progressively debased weight and purity. 

  • A Roman ~23k gold coin introduced by Diocletian in AD 301 and called by that name, but reissued at a slightly lower weight by Constantine I. 

  • The formal name of the oblique strikethrough overlay (as in A̷ and B̸) in Unicode. 

  • The weight of the Roman gold coin, 1/60 of a Roman pound under Diocletian or 1/72 lb. (about 4.5 grams) after Constantine. 

  • The line in a phase diagram marking the temperatures and pressures below which a given substance is a stable solid. 

  • A medieval French weight, 1/20 of the Carolingian pound. 

  • The division line between the numerator and the denominator of a fraction, whether horizontal or oblique. 

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