Joel 2:1 –“Blow the trumpet in Zion, and sound an alarm in My holy mountain! Let all the inhabitants of the land tremble; for the day of the Lord is coming, for it is at hand”

The Complete Jewish Bible using 69 times the work shofar or trumpet. In the Old Testament (OT) it use 55 times, and New Testament (NT) it uses 14 times. The Greek word "salpiggi"is often translated both sofar and trumpet, but from the resurrection context, it would be used shofar. Shofar is often made from the horns of rams, sometimes with the horns of sheep, goats, or antelopes.

“Wherever you hear the sound of the shofar, rally to us there. Our God will fight for us.” Nehemiah 4:20 

​The shofar speaks of God's musical instrument and spiritual weapons.More at the book "The Refiner's Fire" in 11th chapter SHOFAR HORN OF SALVATION.