Soulbound

Soulbinding is a mechanism to prevent an item(s) from being traded or sold for Gold currency.

This was largely prevalent for the MMO zOMG!. Which had its only weapon (the Rings) bound to the Player. This was done because high level rings [10 CL] were being sold for large amounts of gold, and in turn, were giving people who were still early in the game an unbalanced advantage. By having a high level rings, Players were able to complete the game within days.