The bivector imaginary pseudoscalar

i2 = Mul2[{0, {1, 0}, 0}, {0, {0, 1}, 0}] ; (* the pseudoscalar and complex number unit imaginary *)

i2//MatrixForm

( {{0}, {{0, 0}}, {1}} )

Mul2[i2, i2]//MatrixForm

( {{-1}, {{0, 0}}, {0}} )

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