The haček is a diacritic mark used in the Czech and Lithuanian languages. (Note that the "c" in haček should have a haček over it.) It looks like an upside-down circumflex or a pointed breve-essentially a small "v" over the letter. (I've managed to find a HTML symbol for the "s": š. It may appear over letters including "Č", "Ď", "Ě", "Ř", etc.

The "Ř" with a hacek is acknowledged in the Guinness Book of World Records as the rarest sound in the world. It is described as a "rolled post-alveolar fricative".

So what does it sound like?

Č: /ch/

Ď: The same way the tilde modifies the n, the hacek modifies the d--it sort of adds a tiny vowel sound.
/dy/, /diuh/, /die/

Ě:Modifies the letter that it follows. For example de => dyeh.
/yeh/, /eih/

Ř: Might be described as a strongly rolled /r/ with a kind of undertone of /d/ and an expulsion of air.
/rrrdh/, /rd/

Š: /sh/

Ť:Like "d", only with /t/.
/tiuh/ etc.

Ž: /zh/ Kind of like pronouncing the letter J with your teeth together, like /jh/.

Additional information due to Gritchka:

Ň: /ny/

Č, Š, and Ž with haceks are used in Croatian and Latvian.

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