Hypoabelian group - AbsoluteAstronomy.com

"Hypoabelian group" is an archaic name for an orthogonal group
Orthogonal group
In mathematics, the orthogonal group of degree n over a field F is the group of n × n orthogonal matrices with entries from F, with the group operation of matrix multiplication...

over a field of characteristic 2.
A hypoabelian group can mean a group whose perfect core
Perfect core
In mathematics, in the field of group theory, the perfect core of a group is its largest perfect subgroup. Its existence is guaranteed by the fact that the subgroup generated by a family of perfect subgroups is again a perfect subgroup...

is trivial

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