Morse code

Morse code is a method of transmitting text information as a series of on-off tones, lights, or clicks that can be directly understood by a skilled listener or observer without special equipment.
In Spyro: Shadow Legacy, the armadillo Bandit used the morse code for SOS when he was trapped in the Shadow Realm version of Cliff Town. He thought that Spyro had heard his code when he came to rescue Bandit.