Teruah means shout, war cry, blast of a trumpet, or alarm. It appears about 36 times. It describes the shout of victory, the trumpet blast signaling war or festival, and the joyful noise of worship.
The teruah is both a call to arms and a shout of praise. 'Shout for joy to the LORD' (Psalm 98:4) and the trumpet blast on the Day of Atonement both use teruah. It signals God's presence, victory, and the召calling召 of His people to attention. The final trumpet (teruah) will announce Christ's return.