What does the symbol ϕ mean in skeletal formulae?
According to the Graphical Representation Standards for Chemical Structure Diagrams (IUPAC Recommendations 2008), the Greek lowercase letter phi $(\phi)$ may be used to represent a phenyl group.


  It is acceptable to use the Greek lowercase letter phi $(\phi)$ to represent a phenyl group. That abbreviation has a long history, and ambiguity is unlikely since that letter is rarely used for other purposes in chemical structure diagrams.
  
  


Note that this traditional use is only considered “acceptable”, i.e. not “preferred”.

According to the current version of Nomenclature of Organic Chemistry – IUPAC Recommendations and Preferred Names 2013 (Blue Book), the preferred name for the hydrocarbon parent ring component is the retained name chrysene. The indicated numbering of this polycyclic hydrocarbon is is the result of the application of the specific criteria used to number fused ring systems:



Therefore, the complete name for the entire compound given in the question is 1,3,7,9-tetraphenylchrysene.