Most works on seniority in nuclear physics involve particles of one kind-only proton or only neutrons. However, we had previously observed that in a single j shell calculation for 48Cr (four f7∕2 protons and 4 f7∕2 neutrons), a quantum number emerges that can be assigned to a given wave function, namely SEN=(−1)((vp+vn)∕2). A given column vector will either have SEN=+1 or SEN=−1. This is exclusive to mid-shell nuclei. But there is more. There is another quantum number common to all N=Z nuclei 44Ti, 46V and 48Cr. This leads to additional zeros in the components of the column vectors.