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Reference.org
Anti-diagonal matrix
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<p>In <a href="/facts/Mathematics/pxTouaz4">mathematics</a>, an anti-diagonal matrix is a <a href="/facts/Square_matrix/5TP9mNNn">square matrix</a> where all the entries are zero except those on the <a href="/facts/Diagonal_of_a_matrix/39z9sIRb">diagonal</a> going from the lower left corner to the upper right corner (↗), known as the anti-diagonal (sometimes Harrison diagonal, secondary diagonal, trailing diagonal, minor diagonal, off diagonal or bad diagonal). </p>