a mark (ˇ) used over certain consonant letters in the orthography of some languages to indicate a specific sound, or used in certain systems of symbols for representing speech sounds
See haček in American Heritage Dictionary 4
noun
A diacritical mark (˘) that resembles an inverted circumflex and is used over certain letters, such as č, to indicate quality of pronunciation.
Origin:
Origin: Czech háček
Origin: , diminutive of hák, hook
Origin: , from Middle High German hāken
Origin: , from Old High German hāko; see keg- in Indo-European roots