When you play an electric guitar it's pretty easy to understand the differences when describing the type. You've got T-types (Telecasters), S-types (Stratocasters), LPs (Les Pauls) and then a few sub-categories (double-cut, single-cut, etc.). Piece of cake. Even the Firebirds, Explorers, Jaguars, Mustangs, etc. are fairly easy to understand and visualize.
But it's a whole different world when it comes to acoustics. Every maker of acoustics seems to use their own nomenclature when it comes to sizes and models. And their "code" is nearly indecipherable. For example, C. F. Martin, perhaps the preeminent maker of acoustic guitars has a naming/numbering system that only the most die-hard of acoustic players recognizes immediately. The creator of the "dreadnaught/dreadnought" (even the spelling is confusing!) size and shape has designated that model as a "D." As in D-18, D-28, D-35, Duh. From there it gets arcane and mysterious. The common models are 00, 000, OM. But wait, there's more: The 000 and OM are the same size, but a different scale. Right. To keep moving the ball down the field, Martin has also made new models (SC) and tweaked existing sizes and shapes (DJr, 000-10E, etc.). What's a person to do?
Well, if every maker used Martin's conventions, it might be easier to understand, but Taylor, arguably Martin's equal in the acoustic marketspace, uses a completely different naming convention. They use a lot of "Grands" in their names: Grand Symphony, Grand Orchestra, Grand Pacific, Grand Concert, and so on. But they also have the Academy series, the K line, the GS Mini (Grand Symphony, but smaller) and so on. Taylor also serializes their lineup. So, they have the 100, 200, 300, 400, 500 and so on. I have a 322ce and a 652ce. Each number and letter denotes something. Yay. But can anyone remember them all? And there is size/shape overlap between the two companies, but it takes an advanced degree in comparative studies to chart them. What's a person to do?
I have been playing acoustic guitars for over 56 years. I am only now beginning to understand the "code" when looking at a guitar listing. Still, it's always a bit of a by-guess-by-golly crapshoot. For example, I own a Martin OMC-15ME. In fact, the full description of this particular guitar is "OMC-15ME Streetmaster in Weathered Red." Whew. I am probably mistaken, but the way I decode this is it's an Orchestra Model (OM) with a cutaway (C) in size 15 made of Mahogany (M) with electronics (E). At least that how I see it.
Fifty-six years it's taken me to partially decode this stuff. Why do guitar makers make it so hard?