Clarion (noun)

1. A type of trumpet with a clear, shrill sound.
2. A loud, clear call or sound, especially one used to signal alarm.

Origin:

From the latin word "clarionem" meaning "a trumpet".

Examples:

1. The clarion call of the trumpet signaled the start of the parade.
2. The clarion's loud sound echoed through the mountains.
3. The clarion was used to summon knights to battle.
4. The clarion woke up the entire camp with its loud, shrill sound.
5. The clarion was played to announce the arrival of the king.