signing vs waving

signing

noun
  • The use of sign language; skill at using a sign language. 

  • The act of concluding a contract, especially by an athlete or entertainer with a company. 

  • A player signed by a sporting organization. 

  • An event (signing session) in a bookshop etc. where an author signs copies of his or her book. 

waving

noun
  • The motion of something that waves. 

  • Repeated moving of arms or hands to signal. 

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