Shofar

A shofar is an instrument traditonally made from the horn of a ram or another kosher animal. It was used in ancient Israel to announce the New Moon (Rosh Chodesh) and to call people together. It was also blown on Rosh Hashanah, to mark the beginning of the New Year.


Information from http://www.jewishvirtuallibrary.org/jsource/Judaism/shofar.html