\v{a}The \v{a} command in LaTeX is used to place a caron (also known as a háček or wedge) 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'
\v{a}Caron accent over the letter 'r', used in Czech and Slovak languages
\v{r}Caron accent over the letter 's', used in languages like Czech, Slovak, and Serbo-Croatian
\v{s}