Cephalomancy
Cephalomancy is a historical term for divination using a head, often an animal's, according to the consulted compilations.How to approach it
Understanding this practice involves identifying the period, place and source describing it. A preserved object, a literary account and a later reconstruction offer different kinds of information.
An important distinction
It is not an established precursor of phrenology and cannot reveal intelligence or character from skull shape.
An example to explore
When studying an old source, identify the author's claims and the beliefs being described.
Taking the idea further
To explore further, compare the related concepts and note differences in material, procedure and interpretation. If you open a related tool, read its own rules; sharing a symbol does not mean carrying out the same practice.