Settings used to specify a physical unit.
| Centimeters | Use centimeters. A centimeter is 1/100 of a meter. |
| Millimeters | Use millimeters. A millimeter is 1/10 of a centimeter, and 1/1000 of a meter. |
| Inches | Use inches. |
| Points | Use points. One point is 1/12 of a pica, and 1/72 of an inch. |
| Picas | Use picas. One pica is 1/6 of an inch. |