Which was your most useful loot obtained randomly through RNG? It doesn't have to be an exotic or even a rare weapon, it just had to be very useful to you during your stint in destiny.
Mine was the MIDA
Edit; Even green/white weapons count, as long as it had helped you the most on your journey. Armor counts too.
Edit+; As long as you can obtain it through chance, it counts. Buying the item doesn't count, neither obtaining it through bounties.
Edit++: You must have already obtained the item, doesn't matter if you later dismantled it. No fantasies about owning something you never had (wish I had an icebreaker though, I'd be the coolest kid in school...)