As you probably know, the unidentified appearance of a wedding ring in ADOM is "nograin ring". However, I have no idea of what nograin is. None of the dictionaries I have consulted list the word, and using three different search engines to look it up only gave me results about no-grain diets. I know this is a somewhat stupid question, but do you guys have any idea about it?

I've also searched this forum and Brinkster in case it's been asked before. Apparently that's not the case in either site.