Symmetric about the Origin
Symmetric across the Origin
Symmetric
with Respect to the Origin
Describes a graph that looks
the same upside down or right side up. Formally, a graph is symmetric
with respect to the origin if it is unchanged when reflected
across both the x-axis and y-axis.

See
also
Symmetric with respect to the x-axis, symmetric
with respect to the y-axis, even
function, odd function
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