Here's how it goes. They have their item crated and ready to go. A call is made for the carrier to pick-up and they ask, "is the crate ISPM 15 compliant?" The typical first response is, "huh?"
Over the past 10 years, more and more countries have adopted this standard to ensure that the wood packaging materials entering their county are free of destructive insects. These insects can cause immense damage to crops and forests when introduced to foreign lands. Therefore, when shipping to one of these countries (see links below) the crate must be stamped as shown in the photo.
http://www.cratersandfreighters.com/cf/ispm15.do
http://www.aphis.usda.gov/import_export/plants/plant_exports/wpm/wpm_faqs.shtml#1
http://en.wikipedia.org/wiki/ISPM_15