What is the meaning of Háček?

A caron; a diacritical mark (ˇ) usually resembling an inverted circumflex, but in the cases of ď, Ľ, ľ, and ť resembling an apostrophe (’) instead.

diminutive of hák; little hook

fishhook

háček (diacritic)

catch, snag (a concealed difficulty, especially in a deal or negotiation)

bow

bow paddler

háček

Source: wiktionary.org