שׁוֹפָר Strong’s #7782 shophar

Then shalt thou send abroad the loud trumpet on the tenth day of the seventh month; in the day of atonement shall ye send abroad the trumpet throughout all your land.

Leviticus 25:9

Made from a ram’s horn, the shofar was used to call an assembly together or an army to battle. The shofar was used in ancient times, as well as in modern times, during the feasts of YHWH and on the Shabbat. In Exodus 19:16, 19:19 and 20:18 the people heard a very loud shofar blast coming from the mountain of God, giving them great fear. This was also the instrument that was sounded when the walls of Jericho fell (Joshua 6:4).