haĉek (2002) vs inverted circumflex

haĉek (2002)

inverted circumflex

noun

  • A dipping tone. 

  • Any diacritic obtained by rotating a circumflex (ˆ) 180°. 

  • A háček. 

How often have the words haĉek (2002) and inverted circumflex occurred in a corpus of books? (source: Google Ngram Viewer )