San Francisco Health Care Security Ordinance & its intersection with the Health Care Accountability Ordinance Joannie C. Chang Office of Labor Standards Enforcement City & County of San Francisco January 2009.
In geometry, a torus (plural tori) is a surface of revolution generated by revolving a circle in three-dimensional space about an axis coplanar with the circle.he flat torus is a torus with the metric inherited from its representation as the quotient, R 2 / L, where L is a discrete subgroup of R 2 isomorphic to Z 2. This gives the quotient the structure of a Riemannian manifold.
A torus palatinus is a bony protrusion on the palate (roof) of mouth. This growth is a normal and usually harmless bony elevation that occurs in the middle portion of the hard palate. Most palatal tori are less than 2 cm in diameter, but their size can vary from person to person and change over time.