# center of symmetry

## center of symmetry

[′sen·tər əv ′sim·ə·trē]
(science and technology)
A point in an object through which any straight line encounters exactly similar points on opposite sides. Also known as symmetry center.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Birkhoff's theorem  assures us that for any non-rotating spherically symmetric distribution of matter, the gravitational effect on any test mass is solely due to whatever mass lies closer to the center of symmetry. This allows us to infer what happens inside the event horizon, by comparing a hypothetical distribution of matter that is identical but with all mass outside the point of interest removed, with that of (say) a collapsing star.
Piezoelectricity is a reversible property possessed by a selected group of materials that does not have a center of symmetry. When a dimensional change is imposed on the dielectric, polarization occurs and a voltage or field is created which is known as direct effect.
Using the symmetry of virgin values for the 4 K plots and the sweep branches for all of these plots, the center of symmetry seems to be between 91[degrees] and 92[degrees].
Using the symmetry of virgin values for the 4 K and 20 K plots and the sweep branches for all of these plots, the center of symmetry seems to be between 91[degrees] and 92[degrees].
Let's note by O the midpoint of the diagonal AB, but O is also the center of symmetry (intersection of the diagonals) of the rectangle AMBN.
The midpoint (or center of symmetry) O has the coordinates
If this principle is good in all cases, then there is no need to take into consideration the center of symmetry of the set S, since for example if we have a 2D piece which has heterogeneous material density, then its center of weight (barycenter) is different from the center of symmetry.
Let's note by O the midpoint of the transverse diagonal AB, but O is also the center of symmetry of the prism.
We assume they have the same optimal points [O.sub.1] [equivalent to] [O.sub.2] [equivalent to] O located in the center of symmetry of the two prisms.
If this principle is good in all cases, then there is no need to take into consideration the center of symmetry of the set S, since for example if we have a 2D factory piece which has heterogeneous material density, then its center of weight (barycenter) is different from the center of symmetry.
The valid axis passes through the tops located in the first and third quadrants, and also through the center of symmetry. The normal to it is an imaginary axis, and also an axis of symmetry around which it is possible to combine both quadrants.

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