0 the symbol ˇ , used over some letters in some languages to shows that the letter has a different pronunciation:
He is responsible for introducing the use of diacritics, especially the háček, into Czech spelling in order to represent each sound by a single symbol.
The name Janacek should have a hacek on the c.
Abazur ["z" should have a hachek over it] is a Croatian word.
The symbol is called a haček or hachek, pronounced HOTchek.
Typography tends to use the term caron. Linguistics more often uses haček, largely due to the influence of the Prague School.
