Graphology

Graphology was a subject Victoria Waterfield studied while the Second Doctor and Jamie encountered the Sixth Doctor and Peri. The nature of the subject was unclear. (DW: The Two Doctors)

Behind the scenes
In the real world, graphology is the study of handwriting. However, as it's not considered any more scientific than astrology, it seems an odd thing for the Doctor to support. It's entirely possible that graphology might describe a different discipline in the Doctor Who universe.