Definition of "haček"

The library of the United States Congress have worked out their own transliteration system and although the “hačeks” does not figure in it, other diacritical signs are employed.

1956, The Bulletin of Zoological Nomenclature, XI, page 12

Gaj’s incentive for the graphical shape of his letters was a native source. This can be seen in his use of the tilde rather than the “haček” (ˇ), as is often incorrectly claimed.

1995, Milan Moguš, A History of the Croatian Language, page 163