alarum

Their guide, light-eyed for scares, seemed to know them all, and reserved his alarum for signs in the sky invisible to the party.

There is also an alarum marked with arabic figures one to twelve.

Caput parvum; alarum basis squamis conspicuis, elongatis imbricata.

Without a moment's delay, I set up an alarum that might have wakened the whole village; at any rate, it woke our whole house.