A hacek or háček (pronounced "'hatchek") is a diacritic (also known as a "caron") placed over certain letters to indicate palatalization[?] in the orthography of some Slavonic languages, such as Czech, and the Baltic languages and Estonian. It looks like an inverted circumflex and its name means "little hook" in Czech.
... Naturphilosophie und die Bearbeitung derselben durch Vera (1868)
Erläuterungen zu Hegels Encyklopädie der philosophischen Wissenschaften (1871).
Two other ...