Engram

While exploring the world of Destiny, players will sometimes come across Encrypted Engrams. Encrypted Engrams are unidentified Uncommon items that need to be decoded before they can be used. Once you've gathered an Engram, you'll need to take it back to the Tower to the Cryptarch, Master Rahool. He will decode the unidentified piece of armor or weapon for a fee. Encrypted Engrams can also be bought directly from him.