\H{a}The command \H{a} is used to place a double acute accent over the letter 'a'. This accent is commonly used in Hungarian typography and is known as the 'Hungarian umlaut'. It modifies the pronunciation of the letter it is applied to.
Hungarian sentence with double acute accents on 'o' and 'a'.
\text{H\H{o}l van a k\H{o}nyvt\H{a}r?}Hungarian phrase meaning 'The operations of the circle', with double acute accent on 'o' and 'u'.
\text{A k\H{o}r m\H{u}veletei}A Hungarian pangram using double acute accents on several vowels.
\text{\H{A}rvízt\H{u}r\H{o} t\H{u}k\H{o}rf\H{u}r\H{o}g\H{e}p}