Heraldry
Defaults: IQ-5 or Savoir-Faire (High Society)-3.
This is the skill of recognizing and designing coats of arms, crests, flags, tartans, and other emblems. A successful roll lets you recognize a knight or a noble from his banner or shield, create attractive and proper arms (without conflicting with existing designs), etc.
In some settings, you might have to specialize in a particular type of Heraldry: Coats of Arms (the usual specialty, described above), Corporate Logos (defaults to Current Affairs (Business)-3), or even Graffiti Tags (defaults to Streetwise-3).
Modifiers: Cultural Familiarity modifiers. Up to +5 to recognize a well-known design, and down to -5 for an obscure design or one that was retired long ago.