235 – .

§  235.  Whenever provided for in this article, except as specifically
  excepted in paragraph d of the preceding section,  the  word  "platinum"
  may  be  applied  by  spelling  it  out  in  full or by the abbreviation
  "plat.", the word "iriduim" may be applied by spelling it out in full or
  by the abbreviation "irid.", the word  "palladium"  may  be  applied  by
  spelling  it  out  in  full  or  by  the  abbreviation  "Pall", the word
  "ruthenium" may be applied  by  spelling  it  out  in  full  or  by  the
  abbreviation  "Ruth.",  the word "rhodium" may be applied by spelling it
  out in full or by the abbreviation "Rhod.", and the word "osmium" may be
  applied by spelling it out in full or by the abbreviation "Osmi.".