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<div style="font-size:30px">'''SIGNATURE'''</div><br/>
<div style="font-size:30px">'''MATRIX("SIGNATURE",order)'''</div><br/>
*<math>order</math> is the size of the Signature matrix.
==Description==
*This function returns the matrix of order 3 with the property of signature matrix.
*A signature matrix is a diagonal elements are <math>\pm</math>
*So signature matrix is of the form:
*Any such matrix is its own inverse, hence is an involutory matrix.
*It is consequently a square root of the identity matrix.
*Also that not all square roots of the identity are signature matrices.
*The signature matrices are both symmetric and involutory,i.e.,they are orthogonal.
*Consequently, any linear transformation corresponding to a signature matrix constitutes an isometry.