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Built-in Mathematica Symbol

SpanSymmetric

This function has not been fully integrated into the long-term Mathematica system, and is subject to change.

SpanSymmetric
is an option for selections that specifies whether vertically expandable characters are symmetric about the axis of the selection.

Certain types of expressions can appear asymmetric when enclosed by spanning characters. An example is fractions in which the numerator is much more complex than the denominator (or vice versa).

With the default setting SpanSymmetric->True, the size of the spanning characters above and below the axis are adjusted to be equal, giving the expression a more symmetric appearance.

With the setting SpanSymmetric->False, the size of the spanning characters is not adjusted.