Assuming you mean two symmetrical sides, the term is called bilaterally symmetric.

W. T. Welford has written:

'Aberrations of optical systems' -- subject(s): Aberration, Design and construction, Geometrical optics, Optical instruments

'High collection nonimaging optics' -- subject(s): Optical instruments

'Useful optics' -- subject(s): Optical instruments, Optics

'Aberrations of the symmetrical optical system' -- subject(s): Aberration, Design and construction, Geometrical optics, Optical instruments

CentrO was created in 1996.

The address of the El Centro Public Library is: 539 State Street, El Centro, 92243 2973

Centro Habana's population is 158,151.