'Trumpet' in the Bible

I was in the Spirit on the Lord's day, and I heard behind me a loud voice, like a trumpet

After these things I looked and saw a door opened in heaven, and the first voice that I heard, like a trumpet speaking with me, was one saying, "Come up here, and I will show you the things which must happen after this."

saying to the sixth angel who had one trumpet, "Free the four angels who are bound at the great river Euphrates!"