The musical instrument traditionally blown at the end of Yom Kippur is the shofar.
A shofar is a ritual horn, usually made from a ram’s horn. Its sound marks the conclusion of the day’s fasting and extended prayers, especially after the Neilah service, the final service of Yom Kippur. Many communities sound one long blast called a tekiah gedolah.
The shofar is best known for Rosh Hashanah, when it is sounded repeatedly during synagogue services. It also appears during the month of Elul and at the close of Yom Kippur. It is not simply a Jewish version of a modern trumpet: the shofar has no valves, and players change its notes by controlling their lips and breath.
The blast is also linked with biblical imagery, including the revelation at Mount Sinai and the Jubilee year. A common mix-up is confusing the shofar with the silver trumpets described in the Torah; those are distinct instruments with different ritual uses.