entreat vs interrogation mark

entreat

noun
  • An entreaty. 

verb
  • To treat with, or in respect to, a thing desired; hence, to ask for earnestly. 

  • To beseech or supplicate (a person); to prevail upon by prayer or solicitation; to try to persuade. 

interrogation mark

noun
  • A question mark. 

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