CWS: Casual Weapons Shipment
NMA: Normal Master Artificer
HLoB: Hard Lord of Blades
LeetDD: Elite Dreaming Dark (or eDD or BB: DD)
EDA: Epic Devil Assault
Simple examples (using quest abbreviations as well, but just examples) for the purposes. E is Epic, e is Elite, as generally understood. Some people will use both E and e for Epic, though, so using a different abbreviation for Elite is key. Generally you can tell, though.