quincunx matrix

2x2 matrix with 1 and -1 coefficients

en-US/ˈkwɪŋkəŋks ˈmeɪtɹɪks/
en-GB/ˈkwɪnkʌŋks ˈmeɪtɹɪks/

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Hadamard matrixtwo-by-two matrix