Principal directions - In differential geometry, one of the directions of principal curvature.
Principal | One Direction | Principal (school) | principal | No Direction Home | Victoria Principal | Radio direction finder | Principal Skinner | National Film Award for Best Direction | Cardinal direction | The Bootleg Series Vol. 7: No Direction Home: The Soundtrack | Principal (university) | Vertical direction | Relative direction | Principal Secretary | Principal Park | Principal (music) | Principal meridian | Principal Hayley Group | Principal Galaxies Catalogue | principal dancer | Principal (academia) | New Direction | Direction of Things to Come | The Opposite Direction | Spiritual Direction | Principal Speaker | Principal Solicitor for Ireland | Principal Snyder | principal Snyder |