Section 28-408.6.2. Identification

All  business  vehicles,  advertising,
  websites and  stationery  used  in  connection  with  a  master  plumber
  business  shall  display  prominently the full name of the licensee, the
  words  "N.Y.C.    licensed  plumber,"  the  licensee's  number  and  the
  licensee's  business address. If the business is conducted under a trade
  name, or by a partnership or corporation, the trade name, partnership or
  corporate name shall be placed immediately above the full name or  names
  of  the  licensed master plumber or licensed master plumbers to whom the
  plates were issued.