horn

Concise Bible Dictionary:

These, as trumpets, are mentioned only at the taking of Jericho, though doubtless they were used at other times (Josh. 6:4-134And seven priests shall bear before the ark seven trumpets of rams' horns: and the seventh day ye shall compass the city seven times, and the priests shall blow with the trumpets. 5And 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. 6And Joshua the son of Nun called the priests, and said unto them, Take up the ark of the covenant, and let seven priests bear seven trumpets of rams' horns before the ark of the Lord. 7And he said unto the people, Pass on, and compass the city, and let him that is armed pass on before the ark of the Lord. 8And it came to pass, when Joshua had spoken unto the people, that the seven priests bearing the seven trumpets of rams' horns passed on before the Lord, and blew with the trumpets: and the ark of the covenant of the Lord followed them. 9And the armed men went before the priests that blew with the trumpets, and the rereward came after the ark, the priests going on, and blowing with the trumpets. 10And Joshua had commanded the people, saying, Ye shall not shout, nor make any noise with your voice, neither shall any word proceed out of your mouth, until the day I bid you shout; then shall ye shout. 11So the ark of the Lord compassed the city, going about it once: and they came into the camp, and lodged in the camp. 12And Joshua rose early in the morning, and the priests took up the ark of the Lord. 13And seven priests bearing seven trumpets of rams' horns before the ark of the Lord went on continually, and blew with the trumpets: and the armed men went before them; but the rereward came after the ark of the Lord, the priests going on, and blowing with the trumpets. (Joshua 6:4‑13)).

Strong’s Dictionary of Greek Words:

Greek:
κέρας
Transliteration:
keras
Phonic:
ker’-as
Meaning:
from a primary κάρ (the hair of the head); a horn (literally or figuratively)
KJV Usage:
horn

From Manners and Customs of the Bible:

1 Chronicles 25: 5. All these were the sons of Heman the king’s seer in the words of God, to lift up the horn.
Some of the earliest wind instruments were no doubt made of the horns of animals, and when afterward metals were used in their manufacture they retained more or less of the original shape, and continued to be called by the original name. The difference between the keren, “horn,” and the shophar, “trumpet,” “cornet,” is supposed to have been principally in the shape, the latter having less of a curved shape than the former. See note on Psalm 98:66With trumpets and sound of cornet make a joyful noise before the Lord, the King. (Psalm 98:6) (#447). The keren is mentioned as a musical instrument in Joshua 6:55And 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. (Joshua 6:5) and in Daniel 3:5,7,10,155That at what time ye hear the sound of the cornet, flute, harp, sackbut, psaltery, dulcimer, and all kinds of music, ye fall down and worship the golden image that Nebuchadnezzar the king hath set up: (Daniel 3:5)
7Therefore at that time, when all the people heard the sound of the cornet, flute, harp, sackbut, psaltery, and all kinds of music, all the people, the nations, and the languages, fell down and worshipped the golden image that Nebuchadnezzar the king had set up. (Daniel 3:7)
10Thou, O king, hast made a decree, that every man that shall hear the sound of the cornet, flute, harp, sackbut, psaltery, and dulcimer, and all kinds of music, shall fall down and worship the golden image: (Daniel 3:10)
15Now if ye be ready that at what time ye hear the sound of the cornet, flute, harp, sackbut, psaltery, and dulcimer, and all kinds of music, ye fall down and worship the image which I have made; well: but if ye worship not, ye shall be cast the same hour into the midst of a burning fiery furnace; and who is that God that shall deliver you out of my hands? (Daniel 3:15)
. In the passage in Daniel it is translated “cornet.”