Evolution of Science

D                       = Director

Prof                   = Professor or Full Professor

AProf                = Associate Professor

Asst Prof           = Assistant Professor

Aj Asst Prof      = Adjunct Assistant Professor

Research Asso   = Research Associate

Postdoc             = Postdoctorate

PhD                  = Doctor of Philosophy

MSc                  = Master of Science

BSc                   = Bachelor of Science

The letter 'size', eg. BSc, represents the imaginal percentage of each degree in top down hierarchy of Science and 'space' allowed for BSc indicates popularity or common among peers. 

As the old and usual saying goes "Had I known earlier, ..."