sigil

 
Pronunciation: /ˈsɪdʒɪl/

noun

  • an inscribed or painted symbol considered to have magical power.
  • archaic a seal: the supply wains bore the High King’s sigil
  • literary a sign or symbol: a 1925 Buick limousine, the sigil of Tom’s naturalization

Origin:

late Middle English: from late Latin sigillum 'sign'