High Quality Content by WIKIPEDIA articles! Greek vehicle registration plates are composed of three letters and four digits per plate (e.g. AAA-1000). The letters represent the district (prefecture) that issues the plates while the numbers begin from 1000 to 9999. Similar plates with digits beginning from 1 to 999 are issued for motorcycles which exceed 50 cc. With the exception of Athens and Thessaloniki, all districts are represented by the first 2 letters. The final letter in the sequence changes in Greek alphabetical order after 9,000 issued plates. For example, Patras plates are AXA-1000, where AX represents the Achaia prefecture of which Patras is the capital.