OOAK = "One Of A Kind". This term isn't just used when talking about sculptures, although it seems to be its primary place of use, it's also used for OOAK toys and other collectible, non-sculpture related items.
Cure = the process of putting a sculpture, usually made of polymer clay, in an oven to "cure" or harden the sculpt to solidify its shape. More commonly known / referred to as "baking".
Armature = a framework to support the clay or other material used in modeling. It can be thought of as the sculpture's "bones". It's a wire frame on the inside of the sculpture to help with keeping the sculpture from just being a floppy clump of clay, much like our bones do for us.
Mohair = used for doll / sculpture hair. The long soft silky hair that makes up the outer coat of the Angora goat. Is also referred to as Tibetan Lamb wool hair.
Viscose Doll Hair = This is a very fine hair. It's very smooth and a little stringy. In my experience I find that this is the closest to straight human hair.
Moonies = A moonie is a bubble of air that gets trapped in the polymer clay and when you bake your piece, it will show as a whitish spot in the form of a half moon or a bump in a lighter color. That’s why they’re called “moonies”
TLS = Translucent Liquid Sculpey, also referred to as Liquid Sculpey. This is used as an adhesive to attach two pieces of polymer clay that have already been cured and are hard. Brush it on both sides of item needing to be joined, then bake. If you allow the TLS to sit a bit, it will become thicker and might work better to hold pieces together prior to and while baking.
Polymer Clay = is a shapeable material based on the polymer polyvinyl chloride (PVC). It usually contains no clay minerals, and is only called "clay" because its texture and properties resemble mineral clay.
BJD = A Ball-Jointed Doll is any doll that is articulated with ball and socket joints.
WIP = Work-In-Progress. Often used when people post incomplete photos of the project they're currently working on.