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Projective orthogonal group

twofold quotient of the orthogonal group: PO(n) = O(n)/{±1}

Pronunciation
/prəˈʤɛktɪv ɔrˈθɑɡənl ɡrup/
/prəˈʤɛktɪv ɔːˈθɒɡənəl ɡruːp/