κώδων (kōdōn)

a bell , (Aeschulus Tragicus):—;in fortified towns an officer went round at night with a bell to challenge the sentries, and see that they were awake, (Thucydides); ὡς κώδωνα ἐξαψάμενος like one with an alarm-bell in his hand, (Demosthenes Orator) (ML)