Form
Never uses a datum as a reference.
| Characteristic | Symbol |
|---|---|
| Straightness |  |
| Flatness |  |
| Circularity (Roundness) |  |
| Cylindricity |  |
Profile
Sometimes uses a datum as a reference.
| Characteristic | Symbol |
|---|---|
| Profile of a line |  |
| Profile of a surface |  |
Orientation
Always uses a datum as a reference.
| Characteristic | Symbol |
|---|---|
| Angularity |  |
| Perpendicularity |  |
| Parallelism |  |
Location
Always uses a datum as a reference.
| Characteristic | Symbol |
|---|---|
| Position |  |
| Concentricity |  |
| Symmetry |  |
Runout
Always uses a datum as a reference.
| Characteristic | Symbol |
|---|---|
| Circular runout |  |
| Total runout |  |