defacement

noun3

1. •
   An act of defacing; an instance of visibly marring or disfiguring something.

   • Some consider the defacement of the Sphinx to be the most egregious crime of Napolean's campaigns.
2. •
   An act of voiding or devaluing; nullification of the face value.

   • The soldiers found a variety of creative uses for their payment scrip after its defacement to scrap paper; some used it as toilet paper.
3. •
   A symbol added to a flag or coat of arms to change it or make it different from another.