The name was used in ancient times to signify the commanding officer of a tagma (battalion), alghough nowadays battalions are typically commanded by Lieutenant Colonels. The rank was roughly equivalent to the Legatus of a Roman legion.
In the modern Hellenic Army the rank is superior to an Lokhagos (Captain) and inferior to an Antisyntagmatarkhis (Lieutenant Colonel). The insignia consists of a flaming grenade and a golden star. The average modern tagma consists of three main companies with uniform equipment, a heavy weapons company and a command company which is responsible for the [logistics] of the tagma.