The word "horn" has many interpretations in the Bible.
(Ref 1) On a literal note, it refers to the bony structure on an animal's head, with which it attacks its prey and defends itself from its predators.
(Ref 2) The horn was also cut off and used to carry anointing oil.
1Sam 16:13 Then Samuel took the horn of oil, and anointed him in the midst of his brethren: and the Spirit of the LORD came upon David from that day forward.
Here we see Samuel anointing David as King, using oil from the horn.
In Psalms, David refers to the word "horn" to imply both strength and anointing.
Ps 92:10 But my horn shalt thou exalt like the horn of an unicorn: I shall be anointed with fresh oil.
1Kings 1:39 And Zadok the priest took an horn of oil out of the tabernacle, and anointed Solomon
(Ref 3) Not only that, the horn (mostly a ram's) was also cut off and used as a trumpet. It is commonly known as a "Shofar", was used to sound the battle-cry when going to war.
Josh 6:4 And 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.
5 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.
But did you know that there is another great significance to the horn?
(Ref 4) The altars in the tabernacle and in the temple had 4 horns at the four corners. The Priest would sprinkle blood upon the horns to make atonement for sin.
Lev 4:7 7 And the priest shall put some of the blood upon the horns of the altar of sweet incense before the LORD,
Lev 8:15 Moses took the blood, and put it upon the horns of the altar round about with his finger, and purified the altar, and poured the blood at the bottom of the altar, and sanctified it, to make reconciliation upon it.
(Ref 5) Also, anyone holding the horns of the altar was spared from death.
1Kings 1:50 And Adonijah feared because of Solomon, and arose, and went, and caught hold on the horns of the altar.
53 So king Solomon sent, and they brought him down from the altar. And he came and bowed himself to king Solomon: and Solomon said unto him, Go to thine house.
The horn signifies atonement, mercy and refuge. It was dabbed with blood from the sin offering, and anyone holding on to it was given a new lease of life. They obtained God's mercy and salvation.
The temple at Jerusalem has been destroyed, and there is no more physical altar there. Does that mean we no longer have a means of salvation and refuge?
Absolutely not! We still have a "horn of Salvation" raised up for us!
Ps 18:2 The LORD is my rock, and my fortress, and my deliverer; my God, my strength, in whom I will trust; my buckler, and the horn of my salvation, and my high tower.
Isa 12:2 Behold, God is my salvation; I will trust, and not be afraid: for the LORD JEHOVAH is my strength and my song; he also is become my salvation.
Luke 1:67 And his father Zacharias was filled with the Holy Ghost, and prophesied, saying,
68 Blessed be the Lord God of Israel; for he hath visited and redeemed his people, 69 And hath raised up an horn of salvation for us in the house of his servant David;
Yes, the Lord Jesus Christ is our "horn of Salvation"!
(Ref 5) He grants new life to anyone who holds on to Him. (Rom 8:1, 2Cor 5:17)
Rev 7:10 Salvation to our God which sitteth upon the throne, and unto the Lamb. 14. These are they which came out of great tribulation, and have washed their robes, and made them white in the blood of the Lamb. 15 Therefore are they before the throne of God, and serve him day and night in his temple: and he that sitteth on the throne shall dwell among them. 16 They shall hunger no more, neither thirst any more; neither shall the sun light on them, nor any heat. 17 For the Lamb which is in the midst of the throne shall feed them, and shall lead them unto living fountains of waters: and God shall wipe away all tears from their eyes.