L2 Coin is a currency that can be used for buying various items from the L2 Coin Shop in-game, locking crafting slots for random crafting, raid teleportation, item recovery, revenge, and much more.
Your L2 Coin wallet is not shared across characters, servers, or server types (Aden L2 Coin =/ Classic L2 Coin). Your L2 Coin balance is only displayed in-game and is not available to view on the NCSOFT account management page.