

In Hungarian, the double acute is thought of as the letter having both an umlaut and an acute accent. 19th century typographers introduced the double acute as a more aesthetic solution. In the 18th century, before Hungarian orthography became fixed, u and o with umlaut + acute (ǘ, ö́) were used in some printed documents.

Initially, only á and é were marked, since they are different in quality as well as length. Length marks first appeared in Hungarian orthography in the 15th-century Hussite Bible. Letters with the double acute, however, are considered variants of their equivalents with the umlaut, being thought of as having both an umlaut and an acute accent. The signs formed with a regular umlaut are letters in their own right in the Hungarian alphabet-for instance, they are separate letters for the purpose of collation. It is used primarily in Hungarian or Chuvash, and consequently it is sometimes referred to by typographers as hungarumlaut.

The double acute accent ( ˝ ) is a diacritic mark of the Latin and Cyrillic scripts.
