Kama is the currency of Amakna. They are earned by defeating monsters, selling items and completing certain quests. Kamas have no weight, meaning a player can carry millions of kamas as easily he can carry ten.
The symbol for kama is styled K. Any NPC or other game price using K means kama. The suffix 'k' means 1000 of something if it refers to an object. ('10k wheat' means 10,000 wheat.) When it refers to the currency, a k is used to represent normal units and double k ("kk") is used to indicate that the item price is --Thousand. For example, someone is buying a tofu feather for 20k. This means 20 kamas, whereas if he had said 20kk it would have meant 20,000 kamas.