Caron

A caron ( ˇ ) or haček (from ), is a diacritic. This is a special symbol that is written over some letters to show that they are pronounced differently. Some other names for the caron are: wedge, inverted circumflex, and inverted hat.
The caron is used in Baltic, Slavic and Finno-Lappic languages to show that a letter is pronounced differently than normal. Sometimes the caron is drawn over a letter to show that it "used" to be pronounced differently. Usually the caron shows:
The caron looks like an upside-down circumflex ( ˆ ). It looks a lot like the breve symbol, but is more pointed at the bottom. It is also used as a symbol in mathematics.