Communications in Greece

state-owned provider of postal services in Greece

Phryctoria () was a semaphore system used in Ancient Greece. The phryctoriae were towers built on selected mountaintops so that one tower (phryctoria) would be visible to the next tower (usually 20 miles away). The towers were used for the transmission of a specific prearranged message. One tower would light its flame, the next tower would see the fire, and light its own.

Semaphore systems using water-based mechanisms

research in and of Greece that is online and free to read and reuse