'Horn' in the Bible

Have seven priests carry seven ram’s-horn trumpets in front of the ark. But on the seventh day, march around the city seven times, while the priests blow the trumpets.

And it shall come to pass, that when they make a long blast with the ram's horn, and when ye hear the sound of the trumpet, all the people shall shout with a great shout; and the wall of the city shall fall down flat, and the people shall ascend up every man straight before him.