California Business And Professions Code Section 22129

Abbreviations. Whenever provided for in this article, and except as specifically excepted in paragraph (d) of Section 22128: (a) The word platinum may be applied by spelling it out in full or by the abbreviation plat. (b) The word iridium may be applied by spelling it out in full or by the abbreviation irid. (c) The word palladium may be applied by spelling it out in full or by the abbreviation pall. (d) The word ruthenium may be applied by spelling it out in full or by the abbreviation ruth. (e) The word rhodium may be applied by spelling it out in full or by the abbreviation rhod. and (f) The word osmium may be applied by spelling it out in full or by the abbreviation osmi..