Apparently most of you don't know what the destiny database really is. Ever heard of "datamining"? It's when someone or a group of people who are not affiliated with a company dive in to a software's coding and pull out information hidden in it. Essentially that's what this database is, a collection of datamined items found in destiny's coding. All these items you see here (with a few exceptions because OP isn't as well-versed in this game as some of us are), are prototype items that Bungie tested and eventually scrapped. That's what you have to remember: everything that Bungie tests in sandbox is put in the game coding, therefore is viable to datamining. These items most likely were never in the actual game from the start. Notice how these items have no symbol on the top right corner of the image. This signifies that they were developed before or during vanilla destiny. It could also be said, however, that some of these items inspired actual in-game items that we see today. For example, the exotic weapon core could have been reworked into the ikelos fusion core for the sleeper stimulant quest, and the exotic armor shard might have either inspired the exotic shard material, or quite possibly the glass needles that xur sells.The vex raid item might have been the VoG material, and then changed to shards and energy. We may very well see more of these items be incorporated in some way or another into the game in the near future.