Invention is a creation skill, where you use almost every other skill and a great number of items to train. You can do many activities using this skill, such as augmenting items for perks, and making new devices.
Tar Heel is the nickname for a native or resident of North Carolina as well as for the state itself, which is known as the Tar Heel State.
The term TAR is short for Tape ARchive. A tarball or tarfile is the name that describes a group or archive of files that are bundled together using the tar command and usually have the .tar file extension.