Tesera or Tessera: How To spell?
The word Tesera is misspelled against Tessera, a noun meaning "A small piece of marble, glass, earthenware, or the like, having a square, or nearly square, face, used by the ancients for mosaic, as for making pavements, for ornamenting walls, and like purposes; also, a similar piece of ivory, bone, wood, etc., used as a ticket of admission to theaters, or as a certificate for successful gladiators, and as a token for various other purposes."
Tessera has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings te & era which should not be misspelled with single 'S'
Wrong Spelling:  te-s-era  Correct Spelling:  te-ss-era 
Explore spell check of Tessera to spell without errors.