When I emailed, Costco, regarding Kirkland pans that I have been looking at
http://www.costco.com/Browse/Product.aspx?Prodid=11257108&whse=BC&Ne=4000000&eC at=BC|89|56625|54916&N=4017652&Mo=27&No=4&ViewAll= 28&Nr=P_CatalogName:BC&cat=54916&Ns=P_Price|1||P_S ignDesc1&lang=en-US&Sp=C&hierPath=89*56625*54916*55004*&topnav=

the online product mentioned only that there were two layers of stainless
steel; it did not say 18/10 stainless steel.

I emailed Costco regarding this, and here is a partial relevant answer.

"However on our site, if it does not state that it is the 18/10 Stainless,
it is a good possibility that it is not."

**
Here is a good Q&A site that gives lots of information, among this simpler
explanation:
http://www.finishing.com/292/94.shtml
a.. 18/0 would mean 18 percent chromium and 0 percent nickel
a.. 18/8 indicates 18 percent chromium & 8 percent nickel
a.. 18/10 indicates 18 percent chromium & 10 percent nickel.

So, if I understand correctly, perhaps stating only that something is made
of ss, then it could indicate that it would have only a percentage of
chromium and zero to 10 percent nickel. I'm wondering if there would be
another ingredient in the mix, or if it could be 18/0 indicating nothing
else?

Hmmmmm.
Dee Dee