\check{a}The command \check{a} is used in LaTeX to place a caron (or háček) accent over the letter 'a'. This accent is commonly used in various languages to indicate a change in pronunciation.
Caron accent over the letter 'a'.
\check{a}Caron accent over the letter 's', used in languages like Czech.
\check{s}Caron accent over the letter 'c', used in languages like Slovak.
\check{c}