| flapping direction(expression, feature, way, course, direction) |
| flow direction(expression, feature, way, course, direction) |
| fore-aft direction(expression, feature, way, course, direction) |
| fore-and-aft direction(expression, feature, way, course, direction) |
| friction direction(expression, feature, way, course, direction) |
| frontal direction(expression, feature, way, course, direction) |
| genetic code direction(expression, feature, way, course, direction) |
| glide direction(expression, feature, way, course, direction) |
| government policy direction(expression, feature, way, course, direction) |
| grain direction(expression, feature, way, course, direction) |
| gravity direction(expression, feature, way, course, direction) |
| ground direction(expression, feature, way, course, direction) |
| habit direction(expression, feature, way, course, direction) |
| incident direction(expression, feature, way, course, direction) |
| inertial direction(expression, feature, way, course, direction) |
| inverse direction(expression, feature, way, course, direction) |
| landing direction(expression, feature, way, course, direction) |
| lateral direction(expression, feature, way, course, direction) |
| latitudinal direction(expression, feature, way, course, direction) |
| left hand direction(expression, feature, way, course, direction) |