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For unsigned graphs G and H, the characteristic polynomial of different graphmatrices for edge corona, subdivision vertex neighbourhood corona andsubdivision edge neighbourhood corona has already been studied using theconcept of coronal. However, till date no work regarding the spectrum of theseproducts has been studied for signed graphs. In our work, we have filled thisgap and defined these variants of coronae by introducing the concept of reverseorientation (r-orientation). We analyzed the structural properties of theseproduct. Also, the characteristic polynomial of adjacency matrix, Laplacianmatrices (signed and signless) and normalized Laplacian matrix of thesevariants of corona product of regular signed graphs under $r$-orientation isobtained using the concept of signed coronal. These results help us toconstruct infinitely many families of pairs of cospectral signed graphs.

r-orientation of a signed graph and its application on coronae of signed graphs