The shofar trumpet mentioned in the Bible was made from a ram’s horn. It was blown by the priests of God for various purposes. Like today’s siren, which makes a loud, attention-getting sound, the blast of the shofar also demanded people’s attention. Those who heeded could say, (pardon the pun), “shofar, so good!” and be saved from serious injury or death.

Full text here: https://www.tomorrowsworld.org/commentary/shofar-so-good