sounds like a typical loomis model number. you're right about the last number being the rod's relative power. "STR" is g-loomis talk for "steelhead rod", "SAR" for salmon(which is a big factor if you're picking up a 1084, it'll either be a fine drift rod, or a meat stick for trolling herring depending on those first 3 letters).

there isn't any uniform code to it between manufacturers, so when in doubt, look for a catalog or give them a call!