** Spherical aberration, which occurs when light rays strike a lens or mirror near its edge

** M. C. Escher used special shapes of mirrors in order to achieve a much more complete view of his surroundings than by direct observation in Hand with Reflecting Sphere ( also known as Self-Portrait in Spherical Mirror ).

** Spherical panorama projection

** Spherical stone shot for Trebuchets

** coordinate systems ( rectangular, cylindrical, spherical )

** The point of intersection of the axes in the Cartesian coordinate system

** The pole in the polar coordinate system

** Polar coordinate system ( 2D )

** Cylindrical coordinate system ( 3D )

** coordinate terms: Y is a coordinate term of X if X and Y share a hypernym ( wolf is a coordinate term of dog, and dog is a coordinate term of wolf )

** coordinate terms: those verbs sharing a common hypernym ( to lisp and to yell )

** The Montgomery Improvement Association is formed in Montgomery, Alabama, by Dr. Martin Luther King, Jr., and other Black ministers to coordinate a Black people's boycott of all city buses.

** Planning, Training, and Exercise Support ( PTE )-Our mission is to ensure NCS readiness, enhance partnerships within government and industry, coordinate telecommunications operational planning among NCS elements, develop emergency response requirements, and to provide skilled civilians and reservists during crises and emergencies.

** Cartesian coordinate system, for representing position and other spatial concepts in analytic geometry

** The radius in the cylindrical or spherical coordinate systems

** Moreover, W = 0 if and only if the metric is locally conformal to the standard Euclidean metric ( equal to fg, where g is the standard metric in some coordinate frame and f is some scalar function ).

** Geographic coordinate system

** The Back Scattering Alignment ( BSA ) coordinate system is often used in radar applications

** The Forward Scattering Alignment ( FSA ) coordinate system is primarily used in optical applications

** To coordinate and encourage scientific projects using amateur and professional skills ;

** — the origin of the coordinate system in Cartesian coordinates

** the coordinate on the fourth axis in four-dimensional space.

** the coordinate on the first or horizontal axis in a cartesian coordinate system, the viewport in a graph or window in computer graphics

** the coordinate on the second or vertical axis ( backward axis ) in three dimensions ) in a linear coordinate system, or in the viewport of a graph or window in computer graphics

** SS-C1 Sepal radar system

** Defocus aberration, which occurs when a system is out of focus

** immune system: antibody — host — vaccine — immune cell — AIDS — T-cell — leucocyte

** Domestic: extensive microwave radio relay links ; domestic satellite system with 3 earth stations

** IMR-2M1-Simplified model without the mine-clearing system.

** The solar system ( BIG made SMALL )

** CCIR-tones, A selective calling system used in some radio communications systems in some European countries

** Romano-Germanic subgroup ( comprising those legal systems where legal science was formulated according to Roman Law-see also Civil law ( legal system ))

** Dispersion relation, the mathematical description of dispersion in a system

** using another lower-level device driver ( e. g. file system drivers using disk drivers )

** allowing the operating system direct access to hardware resources

** A ground bus or earth bus is a conductor used as a zero voltage reference in a system, often connected to ground or earth.

** LTI system theory

** Digital filter, a system that performs mathematical operations to reduce or enhance certain aspects of a signal

** Informally, any GPS navigation device, especially an automotive navigation system

** Han ' gŭl in the McCune – Reischauer system.

** Hankul in Yale Romanization, a system recommended for technical linguistic studies.

** domestic: interisland microwave system and HF radio police net ; domestic satellite communications system

** ISO 3166-1 numeric – three-digit country codes which are identical to those developed and maintained by the United Nations Statistics Division, with the advantage of script ( writing system ) independence, and hence useful for people or systems using non-Latin scripts.

** Point system:

** Domestic telephone system: a national fiber-optic cable interurban trunk system is nearing completion ; rural exchanges are being improved and expanded ; mobile cellular systems are being installed ; access to the Internet is available ;

** International telephone system: landline connections to Latvia and Poland ; major international connections are to Denmark, Sweden, and Norway by submarine cable for further transmission by satellite

** Bearing and circulating system oils