A scrim is a very light textile made from cotton, or sometimes flax. Their lightweight and translucence means it is often used for curtains. The fabric can also be used for bookbinding and upholstery. Scrims have also seen extensive use in theatre where they are often used for special effects. In theater a scrim can refer to any such thin screen and are made out of a wide variety of substances.
A transaxle is a complex machine that brings together a transmission and final drive components like a differential. In that way, a transaxle is capable of driving the axles without any additional components.
The car's transmission are all the components and systems that take the power from the engine to the wheel. The transaxle is a gearbox like any other, only it's positioned in the middle of the main drive shaft in a front engine - rear wheel drive car (or a front engine 4x4).