Bilon or Billon: How To spell?
The word Bilon is misspelled against Billon, a noun meaning "An alloy of gold and silver with a large proportion of copper or other base metal, used in coinage."
Billon has double "ll" is mispronounced as "l"Remember double 'LL' in between the strings bi & on which should not be misspelled with single 'L'
Wrong Spelling:  bi-l-on  Correct Spelling:  bi-ll-on 
Find more incorrect spellings of Billon to spell right way.