The main currency of the game and is collected via attacking enemies / bounties / missions / items etc. Glimmer can be used to buy almost everything in this game. Ships, To decrypt your engrams, to get some emblems from the actual game, Heavy Ammo, Special and etc.
A strange person (See also: Agent of the Nine) shows up at The Farm every week. He will sell you an Exotic for the right amount of Strange Coins. Abbreviated as SC. The gear on sale will last the whole weekend and will not rotate. Strange Coins can also drop from enemies and bounties and chests. Also can be used at Eris Morn.
You can earn legendary shards by completing Missions. These are then used to purchase items from the Vanguard Quartermaster at The Farm. You can earn legendary shards through bounties also. They can be used at Eris Morn